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cowboyro
Premium
join:2000-10-11
Shelton, CT
reply to DataRiker

Re: Weights and measures

said by DataRiker:

Since the term pound is unqualified it can refer to a mass or a force.

The term pound denotes a mass (when we are talking about "weights"). The pound-force term denotes the gravitational force exerted by a 1lb mass on Earth.


DataRiker
Premium
join:2002-05-19
00000

4 edits
Weight is a force, so if your going to use some subjective context for reference (which is unwise) lb force would be more fitting.

Since neither of you used "pound-force" [lbf] or "pound-mass" [lbm], any argument that one definition is more correct than the other is extremely silly.

The unqualified "pound" should never ever be used in anything but the most informal oral conversations.



BonezX
Basement Dweller
Premium
join:2004-04-13
Canada
kudos:1
reply to cowboyro
said by cowboyro:

said by DataRiker:

Since the term pound is unqualified it can refer to a mass or a force.

The term pound denotes a mass (when we are talking about "weights"). The pound-force term denotes the gravitational force exerted by a 1lb mass on Earth.

LB is a measurement of force(weight is called the normal force of an object fyi), the imperial measurement of mass is the slug.


cowboyro
Premium
join:2000-10-11
Shelton, CT
said by BonezX:

said by cowboyro:

said by DataRiker:

Since the term pound is unqualified it can refer to a mass or a force.

The term pound denotes a mass (when we are talking about "weights"). The pound-force term denotes the gravitational force exerted by a 1lb mass on Earth.

LB is a measurement of force(weight is called the normal force of an object fyi), the imperial measurement of mass is the slug.

According to NIST it's officially defined as a unit of mass. What some people use it as has no bearing over the official definition.


BonezX
Basement Dweller
Premium
join:2004-04-13
Canada
kudos:1
said by cowboyro:

According to NIST it's officially defined as a unit of mass. What some people use it as has no bearing over the official definition.

»en.wikipedia.org/wiki/Slug_%28mass%29
»en.wikipedia.org/wiki/Normal_force

might want to also look outside the united states of stuck in the past, if you did calculations in the scientific community, or about ~90% of the countries in the world in lb you would be laughed at.


DataRiker
Premium
join:2002-05-19
00000

3 edits
reply to cowboyro
said by cowboyro:

According to NIST it's officially defined as a unit of mass. What some people use it as has no bearing over the official definition.

This is a rather silly point since force is defined using mass.

When you understand your circular reasoning get back to me.


cowboyro
Premium
join:2000-10-11
Shelton, CT
reply to BonezX
said by BonezX:

said by cowboyro:

According to NIST it's officially defined as a unit of mass. What some people use it as has no bearing over the official definition.

»en.wikipedia.org/wiki/Slug_%28mass%29
»en.wikipedia.org/wiki/Normal_force

might want to also look outside the united states of stuck in the past, if you did calculations in the scientific community, or about ~90% of the countries in the world in lb you would be laughed at.

The pound is the official unit for mass. Not force, mass.
The slug is a derived unit that makes the 1:1 translation between units of time, length and force so that F=m*a


DataRiker
Premium
join:2002-05-19
00000

4 edits
Force is defined using mass.

If you use pound in science, you will be immediately asked to clarify if you mean force or mass.