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Re: Any tips on learning the metric system? [Re: psi]
    #23077076 -

Oh shit, you're right. Duh. One mole is 6.022×1023 molecules or atoms. A mole weights that substance's molecular mass in grams.

Regardless, the mass of a substance is an immutable property. A gram is always a gram. Mass can be defined as the amount of force required to accelerate an object to a certain velocity. M=F/A


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NotSheekle said
“if I believed she was 16 I would become unattracted to her”

Edited by koods (04/02/16 08:55 PM)

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Re: Any tips on learning the metric system? [Re: koods]
    #23077092 -

Yeah I mean your core point still stands, for a given element or compound a gram represents some fixed number of atoms or molecules.

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Re: Any tips on learning the metric system? [Re: psi]
    #23077118 -

A scale measures the force exerted by an object she to the acceleration of gravity.  As long as you know the acceleration of gravity at the location you are weighing an object, you can calibrate a scale to return the same result anywhere.

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Re: Any tips on learning the metric system? [Re: psi]
    #23077124 -

http://www.engineeringtoolbox.com/fluid-density-temperature-pressure-d_309.html

This shows the density of water as a function of temperature and pressure. Humans can survive at less than half the atmospheric pressure at earth sea level, and since it would be expensive to always maintain a perfectly earthlike environment under all working conditions, humans will probably be working under such low pressure.

It's true that the difference is very small at tolerable changes in pressure, but remember, people will often be wearing pressure suits to tolerate much lower-pressure conditions, which also will inevitably feature a different magnitude of gravitational force than that operating on the surface of the earth. So we no longer have the lynchpin of equivalence between mass and actual weight, either.


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Enlil said:
You really are the worst kind of person.


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Re: Any tips on learning the metric system? [Re: koods]
    #23077129 -

koods said:
A scale measures the force exerted by an object she to the acceleration of gravity.  As long as you know the acceleration of gravity at the location you are weighing an object, you can calibrate a scale to return the same result anywhere.


True, I hadn't thought of that.


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Enlil said:
You really are the worst kind of person.


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Re: Any tips on learning the metric system? [Re: Sophistic Radiance] * 2
    #23077173 -

Pressure has very little effect on the density of liquids. Water is essentially incompressible, a property that allows it to be used in hydraulics. On the other hand, liquids readily expand and contract as temperature changes. The density of boiling water is about 96% that of water at 4°C


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NotSheekle said
“if I believed she was 16 I would become unattracted to her”

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Re: Any tips on learning the metric system? [Re: koods]
    #23077186 -

And 4o is a downright high temperature in many extraterrestrial environments. People would often be working on (if not physically in) environments at temperatures many degrees below zero, celsius. But, making the switch to Kelvin would be seamless, since the actual units are the same.


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Enlil said:
You really are the worst kind of person.


Edited by Sophistic Radiance (04/02/16 09:24 PM)

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Re: Any tips on learning the metric system? [Re: Citizen X]
    #23077202 -

Citizen X said:
Being American it's not taught to us. So I was hoping that there was some way to learn how they interlock, but maybe this wasn't a good idea?



I learned the metric system in georgia in the 80s in public schools


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California Has Legalized Child Prostitution

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Re: Any tips on learning the metric system? [Re: Sophistic Radiance]
    #23077228 -

koods said:
A scale measures the force exerted by an object she to the acceleration of gravity.  As long as you know the acceleration of gravity at the location you are weighing an object, you can calibrate a scale to return the same result anywhere.


I think it may depend on the design of the scale, like wouldn't a triple beam balance balance out at the same reading under different gravity? Not 100% sure on that but a simple "scales of justice" style balance with reference masses is definitely going to correctly indicate which side is heavier (wouldn't work in orbit or anything, but say on a planet). I guess the scale would swing back and forth to varying degrees before balancing out under different gravity though.


Sophistic Radiance said:
http://www.engineeringtoolbox.com/fluid-density-temperature-pressure-d_309.html

This shows the density of water as a function of temperature and pressure. Humans can survive at less than half the atmospheric pressure at earth sea level, and since it would be expensive to always maintain a perfectly earthlike environment under all working conditions, humans will probably be working under such low pressure.

It's true that the difference is very small at tolerable changes in pressure, but remember, people will often be wearing pressure suits to tolerate much lower-pressure conditions, which also will inevitably feature a different magnitude of gravitational force than that operating on the surface of the earth. So we no longer have the lynchpin of equivalence between mass and actual weight, either.


Going just by what is displayed on the chart, it's about a 1% variation over a huge range of pressures (1 bar to 200 bar). It doesn't give any info on what happens below 1 bar and I'm not really up for plugging numbers into formulas right now, but it would surprise me a little if the density went down a lot more dramatically.

Either way though, if this really mattered for some calculation then you would just plug in the relevant details to correct for it.

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Re: Any tips on learning the metric system? [Re: psi] * 1
    #23077297 -

psi said:
koods said:
A scale measures the force exerted by an object she to the acceleration of gravity.  As long as you know the acceleration of gravity at the location you are weighing an object, you can calibrate a scale to return the same result anywhere.


I think it may depend on the design of the scale, like wouldn't a triple beam balance balance out at the same reading under different gravity? Not 100% sure on that but a simple "scales of justice" style balance with reference masses is definitely going to correctly indicate which side is heavier (wouldn't work in orbit or anything, but say on a planet). I guess the scale would swing back and forth to varying degrees before balancing out under different gravity though.
....


Yeah a scale that works using a spring would be calibrated to earth only I think and read differently in different gravity, but a scale that uses comparisons of mass like a balance would read the same anywhere.

That's an interesting point, I never thought of that.

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