Why So Many Units?...

On 20/07/2020 16:52, jlarkin@highlandsniptechnology.com wrote:

<snip>
Weather maps and reports use inches of mercury here. A bad hurricane
can get down to something like 28.
Click to expand...

Millibars here.

Shop and tire pressures are in PSI.

How do Europeans measure tire pressure?
Click to expand...

Bars - a bar is defined as 100kPa which is pretty much sea-level
atmospheric pressure.

In the UK psi are often used too, though for tyres, not tires.

We use all SI for engineering, except PCB layout is in decimal inches.
At least we don\'t work in fractions. Much.
Click to expand...

It\'s a shame an inch isn\'t 25.6mm instead of 25.4mm.

We cook in cups, pounds, ounces, degrees F, pinches, tablespoons, all
sorts of fun stuff.
Click to expand...

Older people would use most of those, except that \'cups\' aren\'t used
here. If they\'re not metric, shoe size increments still use
barleycorns, but few people know that.

The difference between Celsius and Fahrenheit was recently explained on
a radio programme. \"Celsius is a temperature scale where zero degrees is
the freezing point of water and one hundred degrees is the boiling point
of water, whereas Fahrenheit is wrong.\"

Euro paper sizes are neat. A0 is one square metre, so A4 is 1/16 m^2
which means a single sheet of \'normal\' 80gsm printer paper is 5g which
happens to be the same weight as a 20p piece. (And three pre-decimal
pennies weighed one ounce so £1 of copper coinage would weigh 5lb.)

Trivia.

--
Cheers
Clive
 
On 20/07/2020 16:52, jlarkin@highlandsniptechnology.com wrote:

<snip>
Weather maps and reports use inches of mercury here. A bad hurricane
can get down to something like 28.
Click to expand...

Millibars here.

Shop and tire pressures are in PSI.

How do Europeans measure tire pressure?
Click to expand...

Bars - a bar is defined as 100kPa which is pretty much sea-level
atmospheric pressure.

In the UK psi are often used too, though for tyres, not tires.

We use all SI for engineering, except PCB layout is in decimal inches.
At least we don\'t work in fractions. Much.
Click to expand...

It\'s a shame an inch isn\'t 25.6mm instead of 25.4mm.

We cook in cups, pounds, ounces, degrees F, pinches, tablespoons, all
sorts of fun stuff.
Click to expand...

Older people would use most of those, except that \'cups\' aren\'t used
here. If they\'re not metric, shoe size increments still use
barleycorns, but few people know that.

The difference between Celsius and Fahrenheit was recently explained on
a radio programme. \"Celsius is a temperature scale where zero degrees is
the freezing point of water and one hundred degrees is the boiling point
of water, whereas Fahrenheit is wrong.\"

Euro paper sizes are neat. A0 is one square metre, so A4 is 1/16 m^2
which means a single sheet of \'normal\' 80gsm printer paper is 5g which
happens to be the same weight as a 20p piece. (And three pre-decimal
pennies weighed one ounce so £1 of copper coinage would weigh 5lb.)

Trivia.

--
Cheers
Clive
 
On Mon, 20 Jul 2020 18:12:53 +0100, Clive Arthur
<cliveta@nowaytoday.co.uk> wrote:

On 20/07/2020 16:52, jlarkin@highlandsniptechnology.com wrote:

snip

Weather maps and reports use inches of mercury here. A bad hurricane
can get down to something like 28.

Millibars here.

Shop and tire pressures are in PSI.

How do Europeans measure tire pressure?

Bars - a bar is defined as 100kPa which is pretty much sea-level
atmospheric pressure.

In the UK psi are often used too, though for tyres, not tires.

We use all SI for engineering, except PCB layout is in decimal inches.
At least we don\'t work in fractions. Much.

It\'s a shame an inch isn\'t 25.6mm instead of 25.4mm.
Click to expand...

In the early days of Rubylith/Xacto IC design, it was agreed that 1\" =
25 mm.



We cook in cups, pounds, ounces, degrees F, pinches, tablespoons, all
sorts of fun stuff.

Older people would use most of those, except that \'cups\' aren\'t used
here. If they\'re not metric, shoe size increments still use
barleycorns, but few people know that.

The difference between Celsius and Fahrenheit was recently explained on
a radio programme. \"Celsius is a temperature scale where zero degrees is
the freezing point of water and one hundred degrees is the boiling point
of water, whereas Fahrenheit is wrong.\"

Euro paper sizes are neat. A0 is one square metre, so A4 is 1/16 m^2
which means a single sheet of \'normal\' 80gsm printer paper is 5g which
happens to be the same weight as a 20p piece. (And three pre-decimal
pennies weighed one ounce so £1 of copper coinage would weigh 5lb.)

Trivia.
Click to expand...

What scares me is that our aerospace customers design aircraft, jet
engines, helicopters, and satellites in pounds, inches, feet, slugs,
poundals, LFPM, BTUs, horsepower, and degrees F. Their thermal
conductivity units are insane, like BTU/(h·ft·°F) or even worse.
 
On Mon, 20 Jul 2020 18:12:53 +0100, Clive Arthur
<cliveta@nowaytoday.co.uk> wrote:

On 20/07/2020 16:52, jlarkin@highlandsniptechnology.com wrote:

snip

Weather maps and reports use inches of mercury here. A bad hurricane
can get down to something like 28.

Millibars here.

Shop and tire pressures are in PSI.

How do Europeans measure tire pressure?

Bars - a bar is defined as 100kPa which is pretty much sea-level
atmospheric pressure.

In the UK psi are often used too, though for tyres, not tires.

We use all SI for engineering, except PCB layout is in decimal inches.
At least we don\'t work in fractions. Much.

It\'s a shame an inch isn\'t 25.6mm instead of 25.4mm.
Click to expand...

In the early days of Rubylith/Xacto IC design, it was agreed that 1\" =
25 mm.



We cook in cups, pounds, ounces, degrees F, pinches, tablespoons, all
sorts of fun stuff.

Older people would use most of those, except that \'cups\' aren\'t used
here. If they\'re not metric, shoe size increments still use
barleycorns, but few people know that.

The difference between Celsius and Fahrenheit was recently explained on
a radio programme. \"Celsius is a temperature scale where zero degrees is
the freezing point of water and one hundred degrees is the boiling point
of water, whereas Fahrenheit is wrong.\"

Euro paper sizes are neat. A0 is one square metre, so A4 is 1/16 m^2
which means a single sheet of \'normal\' 80gsm printer paper is 5g which
happens to be the same weight as a 20p piece. (And three pre-decimal
pennies weighed one ounce so £1 of copper coinage would weigh 5lb.)

Trivia.
Click to expand...

What scares me is that our aerospace customers design aircraft, jet
engines, helicopters, and satellites in pounds, inches, feet, slugs,
poundals, LFPM, BTUs, horsepower, and degrees F. Their thermal
conductivity units are insane, like BTU/(h·ft·°F) or even worse.
 
On Mon, 20 Jul 2020 18:12:53 +0100, Clive Arthur
<cliveta@nowaytoday.co.uk> wrote:

On 20/07/2020 16:52, jlarkin@highlandsniptechnology.com wrote:

snip

Weather maps and reports use inches of mercury here. A bad hurricane
can get down to something like 28.

Millibars here.

Shop and tire pressures are in PSI.

How do Europeans measure tire pressure?

Bars - a bar is defined as 100kPa which is pretty much sea-level
atmospheric pressure.

In the UK psi are often used too, though for tyres, not tires.

We use all SI for engineering, except PCB layout is in decimal inches.
At least we don\'t work in fractions. Much.

It\'s a shame an inch isn\'t 25.6mm instead of 25.4mm.
Click to expand...

In the early days of Rubylith/Xacto IC design, it was agreed that 1\" =
25 mm.



We cook in cups, pounds, ounces, degrees F, pinches, tablespoons, all
sorts of fun stuff.

Older people would use most of those, except that \'cups\' aren\'t used
here. If they\'re not metric, shoe size increments still use
barleycorns, but few people know that.

The difference between Celsius and Fahrenheit was recently explained on
a radio programme. \"Celsius is a temperature scale where zero degrees is
the freezing point of water and one hundred degrees is the boiling point
of water, whereas Fahrenheit is wrong.\"

Euro paper sizes are neat. A0 is one square metre, so A4 is 1/16 m^2
which means a single sheet of \'normal\' 80gsm printer paper is 5g which
happens to be the same weight as a 20p piece. (And three pre-decimal
pennies weighed one ounce so £1 of copper coinage would weigh 5lb.)

Trivia.
Click to expand...

What scares me is that our aerospace customers design aircraft, jet
engines, helicopters, and satellites in pounds, inches, feet, slugs,
poundals, LFPM, BTUs, horsepower, and degrees F. Their thermal
conductivity units are insane, like BTU/(h·ft·°F) or even worse.
 
jlarkin@highlandsniptechnology.com wrote:

> How do Europeans measure tire pressure?

In \"atmospheres\" or bars. My car has the correct pressure hint plaque
defined in atm. This is the same up to ~1% accuracy, but much clearer to
laymen.

Best regards, Piotr
 
jlarkin@highlandsniptechnology.com wrote:

> How do Europeans measure tire pressure?

In \"atmospheres\" or bars. My car has the correct pressure hint plaque
defined in atm. This is the same up to ~1% accuracy, but much clearer to
laymen.

Best regards, Piotr
 
On Mon, 20 Jul 2020 19:40:48 +0200, Piotr Wyderski
<peter.pan@neverland.mil> wrote:

jlarkin@highlandsniptechnology.com wrote:

How do Europeans measure tire pressure?

In \"atmospheres\" or bars. My car has the correct pressure hint plaque
defined in atm. This is the same up to ~1% accuracy, but much clearer to
laymen.

Best regards, Piotr
Click to expand...

Is that absolute pressure, or relative to atmospheric? Is a flat tire
0 or 1?
 
On Mon, 20 Jul 2020 19:40:48 +0200, Piotr Wyderski
<peter.pan@neverland.mil> wrote:

jlarkin@highlandsniptechnology.com wrote:

How do Europeans measure tire pressure?

In \"atmospheres\" or bars. My car has the correct pressure hint plaque
defined in atm. This is the same up to ~1% accuracy, but much clearer to
laymen.

Best regards, Piotr
Click to expand...

Is that absolute pressure, or relative to atmospheric? Is a flat tire
0 or 1?
 
On Sun, 19 Jul 2020 23:23:18 -0700 (PDT), Ricketty C
<gnuarm.deletethisbit@gmail.com> wrote:

I thought the point of SI was to unify the use of units so everyone
could speak the same language?
Click to expand...

Nope. The purpose of SI was to honor dead scientists before they were
forgotten.

On this ventilator I am find many ways of expressing the same
pressure and flow rates.

Pascals
mmH2O
cmH2O
mBar
and another one I didn\'t even recognize. lol
Click to expand...

Add to your list,
Torr (for vacuum)
atm (atmospheres)
hPa (hectopascals or 100 Pa)

Likewise I\'m finding flow rates indicated as either
ml/s
SLM (standard liters per minute)
Click to expand...

Don\'t forget about drop factor (gtts/min) in IV flow rate:
<http://www.dosagehelp.com/iv_rate_drop.html>
or the \"miners inch\":
<https://en.wikipedia.org/wiki/List_of_unusual_units_of_measurement#Miner\'s_inch>

WTF?! Why have multiple units like this? This is all
in the same field really. People just like to use
different units.
Click to expand...

It might be useful to look at an existing ventilator and see what
units they use. For example, this ventilator (prototype) shows:
<https://upload.wikimedia.org/wikipedia/commons/5/59/PIA23775-NASA-VITAL-Ventilator-20200430.jpg>
pressure = cm H2O
flow rate = Lpm (Liters per minute)
Then, check the front panels of other devices and see if there\'s any
consistency. That\'s much easier than digging through the standards,
specifications, and user manuals.

>Damn them to hell!!!

If you can\'t solve the problem, become part of the problem:
\"List of humorous units of measurement\"
<https://en.wikipedia.org/wiki/List_of_humorous_units_of_measurement>

Suggestion: Include a settable rate timer in dollars per hour that
estimates the operating cost and hospital charges.


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
On Sun, 19 Jul 2020 23:23:18 -0700 (PDT), Ricketty C
<gnuarm.deletethisbit@gmail.com> wrote:

I thought the point of SI was to unify the use of units so everyone
could speak the same language?
Click to expand...

Nope. The purpose of SI was to honor dead scientists before they were
forgotten.

On this ventilator I am find many ways of expressing the same
pressure and flow rates.

Pascals
mmH2O
cmH2O
mBar
and another one I didn\'t even recognize. lol
Click to expand...

Add to your list,
Torr (for vacuum)
atm (atmospheres)
hPa (hectopascals or 100 Pa)

Likewise I\'m finding flow rates indicated as either
ml/s
SLM (standard liters per minute)
Click to expand...

Don\'t forget about drop factor (gtts/min) in IV flow rate:
<http://www.dosagehelp.com/iv_rate_drop.html>
or the \"miners inch\":
<https://en.wikipedia.org/wiki/List_of_unusual_units_of_measurement#Miner\'s_inch>

WTF?! Why have multiple units like this? This is all
in the same field really. People just like to use
different units.
Click to expand...

It might be useful to look at an existing ventilator and see what
units they use. For example, this ventilator (prototype) shows:
<https://upload.wikimedia.org/wikipedia/commons/5/59/PIA23775-NASA-VITAL-Ventilator-20200430.jpg>
pressure = cm H2O
flow rate = Lpm (Liters per minute)
Then, check the front panels of other devices and see if there\'s any
consistency. That\'s much easier than digging through the standards,
specifications, and user manuals.

>Damn them to hell!!!

If you can\'t solve the problem, become part of the problem:
\"List of humorous units of measurement\"
<https://en.wikipedia.org/wiki/List_of_humorous_units_of_measurement>

Suggestion: Include a settable rate timer in dollars per hour that
estimates the operating cost and hospital charges.


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
jlarkin@highlandsniptechnology.com wrote:

> How do Europeans measure tire pressure?

In \"atmospheres\" or bars. My car has the correct pressure hint plaque
defined in atm. This is the same up to ~1% accuracy, but much clearer to
laymen.

Best regards, Piotr
 
mandag den 20. juli 2020 kl. 19.54.06 UTC+2 skrev John Larkin:
On Mon, 20 Jul 2020 19:40:48 +0200, Piotr Wyderski
peter.pan@neverland.mil> wrote:

jlarkin@highlandsniptechnology.com wrote:

How do Europeans measure tire pressure?

In \"atmospheres\" or bars. My car has the correct pressure hint plaque
defined in atm. This is the same up to ~1% accuracy, but much clearer to
laymen.

Best regards, Piotr

Is that absolute pressure, or relative to atmospheric? Is a flat tire
0 or 1?
Click to expand...

relative
 
mandag den 20. juli 2020 kl. 19.54.06 UTC+2 skrev John Larkin:
On Mon, 20 Jul 2020 19:40:48 +0200, Piotr Wyderski
peter.pan@neverland.mil> wrote:

jlarkin@highlandsniptechnology.com wrote:

How do Europeans measure tire pressure?

In \"atmospheres\" or bars. My car has the correct pressure hint plaque
defined in atm. This is the same up to ~1% accuracy, but much clearer to
laymen.

Best regards, Piotr

Is that absolute pressure, or relative to atmospheric? Is a flat tire
0 or 1?
Click to expand...

relative
 
mandag den 20. juli 2020 kl. 19.54.06 UTC+2 skrev John Larkin:
On Mon, 20 Jul 2020 19:40:48 +0200, Piotr Wyderski
peter.pan@neverland.mil> wrote:

jlarkin@highlandsniptechnology.com wrote:

How do Europeans measure tire pressure?

In \"atmospheres\" or bars. My car has the correct pressure hint plaque
defined in atm. This is the same up to ~1% accuracy, but much clearer to
laymen.

Best regards, Piotr

Is that absolute pressure, or relative to atmospheric? Is a flat tire
0 or 1?
Click to expand...

relative
 
On 20/07/20 18:31, John Larkin wrote:
On Mon, 20 Jul 2020 18:12:53 +0100, Clive Arthur
cliveta@nowaytoday.co.uk> wrote:

On 20/07/2020 16:52, jlarkin@highlandsniptechnology.com wrote:

snip

Weather maps and reports use inches of mercury here. A bad hurricane
can get down to something like 28.

Millibars here.

Shop and tire pressures are in PSI.

How do Europeans measure tire pressure?

Bars - a bar is defined as 100kPa which is pretty much sea-level
atmospheric pressure.

In the UK psi are often used too, though for tyres, not tires.

We use all SI for engineering, except PCB layout is in decimal inches.
At least we don\'t work in fractions. Much.

It\'s a shame an inch isn\'t 25.6mm instead of 25.4mm.

In the early days of Rubylith/Xacto IC design, it was agreed that 1\" =
25 mm.
Click to expand...

Ah. Hard metric vs soft metric. Commonly found in the
building trade, where 6\" = 150mm.

That can be a problem where you are mixing two different
types of \"6in\" tiles.



We cook in cups, pounds, ounces, degrees F, pinches, tablespoons, all
sorts of fun stuff.

Older people would use most of those, except that \'cups\' aren\'t used
here. If they\'re not metric, shoe size increments still use
barleycorns, but few people know that.

The difference between Celsius and Fahrenheit was recently explained on
a radio programme. \"Celsius is a temperature scale where zero degrees is
the freezing point of water and one hundred degrees is the boiling point
of water, whereas Fahrenheit is wrong.\"

Euro paper sizes are neat. A0 is one square metre, so A4 is 1/16 m^2
which means a single sheet of \'normal\' 80gsm printer paper is 5g which
happens to be the same weight as a 20p piece. (And three pre-decimal
pennies weighed one ounce so £1 of copper coinage would weigh 5lb.)

Trivia.

What scares me is that our aerospace customers design aircraft, jet
engines, helicopters, and satellites in pounds, inches, feet, slugs,
poundals, LFPM, BTUs, horsepower, and degrees F. Their thermal
conductivity units are insane, like BTU/(h·ft·°F) or even worse.
Click to expand...

Space probes have missed (or was it hit too hard) because of that.
 
On 20/07/20 18:31, John Larkin wrote:
On Mon, 20 Jul 2020 18:12:53 +0100, Clive Arthur
cliveta@nowaytoday.co.uk> wrote:

On 20/07/2020 16:52, jlarkin@highlandsniptechnology.com wrote:

snip

Weather maps and reports use inches of mercury here. A bad hurricane
can get down to something like 28.

Millibars here.

Shop and tire pressures are in PSI.

How do Europeans measure tire pressure?

Bars - a bar is defined as 100kPa which is pretty much sea-level
atmospheric pressure.

In the UK psi are often used too, though for tyres, not tires.

We use all SI for engineering, except PCB layout is in decimal inches.
At least we don\'t work in fractions. Much.

It\'s a shame an inch isn\'t 25.6mm instead of 25.4mm.

In the early days of Rubylith/Xacto IC design, it was agreed that 1\" =
25 mm.
Click to expand...

Ah. Hard metric vs soft metric. Commonly found in the
building trade, where 6\" = 150mm.

That can be a problem where you are mixing two different
types of \"6in\" tiles.



We cook in cups, pounds, ounces, degrees F, pinches, tablespoons, all
sorts of fun stuff.

Older people would use most of those, except that \'cups\' aren\'t used
here. If they\'re not metric, shoe size increments still use
barleycorns, but few people know that.

The difference between Celsius and Fahrenheit was recently explained on
a radio programme. \"Celsius is a temperature scale where zero degrees is
the freezing point of water and one hundred degrees is the boiling point
of water, whereas Fahrenheit is wrong.\"

Euro paper sizes are neat. A0 is one square metre, so A4 is 1/16 m^2
which means a single sheet of \'normal\' 80gsm printer paper is 5g which
happens to be the same weight as a 20p piece. (And three pre-decimal
pennies weighed one ounce so £1 of copper coinage would weigh 5lb.)

Trivia.

What scares me is that our aerospace customers design aircraft, jet
engines, helicopters, and satellites in pounds, inches, feet, slugs,
poundals, LFPM, BTUs, horsepower, and degrees F. Their thermal
conductivity units are insane, like BTU/(h·ft·°F) or even worse.
Click to expand...

Space probes have missed (or was it hit too hard) because of that.
 
On 20/07/20 18:31, John Larkin wrote:
On Mon, 20 Jul 2020 18:12:53 +0100, Clive Arthur
cliveta@nowaytoday.co.uk> wrote:

On 20/07/2020 16:52, jlarkin@highlandsniptechnology.com wrote:

snip

Weather maps and reports use inches of mercury here. A bad hurricane
can get down to something like 28.

Millibars here.

Shop and tire pressures are in PSI.

How do Europeans measure tire pressure?

Bars - a bar is defined as 100kPa which is pretty much sea-level
atmospheric pressure.

In the UK psi are often used too, though for tyres, not tires.

We use all SI for engineering, except PCB layout is in decimal inches.
At least we don\'t work in fractions. Much.

It\'s a shame an inch isn\'t 25.6mm instead of 25.4mm.

In the early days of Rubylith/Xacto IC design, it was agreed that 1\" =
25 mm.
Click to expand...

Ah. Hard metric vs soft metric. Commonly found in the
building trade, where 6\" = 150mm.

That can be a problem where you are mixing two different
types of \"6in\" tiles.



We cook in cups, pounds, ounces, degrees F, pinches, tablespoons, all
sorts of fun stuff.

Older people would use most of those, except that \'cups\' aren\'t used
here. If they\'re not metric, shoe size increments still use
barleycorns, but few people know that.

The difference between Celsius and Fahrenheit was recently explained on
a radio programme. \"Celsius is a temperature scale where zero degrees is
the freezing point of water and one hundred degrees is the boiling point
of water, whereas Fahrenheit is wrong.\"

Euro paper sizes are neat. A0 is one square metre, so A4 is 1/16 m^2
which means a single sheet of \'normal\' 80gsm printer paper is 5g which
happens to be the same weight as a 20p piece. (And three pre-decimal
pennies weighed one ounce so £1 of copper coinage would weigh 5lb.)

Trivia.

What scares me is that our aerospace customers design aircraft, jet
engines, helicopters, and satellites in pounds, inches, feet, slugs,
poundals, LFPM, BTUs, horsepower, and degrees F. Their thermal
conductivity units are insane, like BTU/(h·ft·°F) or even worse.
Click to expand...

Space probes have missed (or was it hit too hard) because of that.
 
Jeff Liebermann wrote:

Nope. The purpose of SI was to honor dead scientists before they were
forgotten.
Click to expand...

Like the famous professors Kilogramov and Metrovich? ;-)

If you can\'t solve the problem, become part of the problem:
\"List of humorous units of measurement\"
https://en.wikipedia.org/wiki/List_of_humorous_units_of_measurement
Click to expand...

LOL! The attoparsec happens to be about an inch. :->

Best regards, Piotr
 
Jeff Liebermann wrote:

Nope. The purpose of SI was to honor dead scientists before they were
forgotten.
Click to expand...

Like the famous professors Kilogramov and Metrovich? ;-)

If you can\'t solve the problem, become part of the problem:
\"List of humorous units of measurement\"
https://en.wikipedia.org/wiki/List_of_humorous_units_of_measurement
Click to expand...

LOL! The attoparsec happens to be about an inch. :->

Best regards, Piotr
 
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