[QUOTE=chalsall;442347]
It is kinda cool that I can comfortably fit into 28" waist pants again[/QUOTE]

Not since I was about 16 years old.
I'm just trying to keep a 36" fitting loose.

[QUOTE=petrw1;442343]Wow 20Kg is about 44 pounds in Canada.[/QUOTE]

20 kg is only 7.3 pounds on the moon.

[QUOTE=Mark Rose;442354]20 kg is only 7.3 pounds on the moon.[/QUOTE]

LOL...

And even on the moon or Mars the men will still hear the enviable question: "Does this space suit make me look fat?

[QUOTE=Mark Rose;442354]20 kg is only 7.3 pounds on the moon.[/QUOTE]The kg is a unit of mass and mass does not change with location. 20 kg on earth is still 20 kg on the moon or even in deep space.

Jacob

[QUOTE=S485122;442379]The kg is a unit of mass and mass does not change with location. 20 kg on earth is still 20 kg on the moon or even in deep space.

Jacob[/QUOTE]
LOL! :tu: Excellent reminder!

[QUOTE=S485122;442379]The kg is a unit of mass and mass does not change with location. 20 kg on earth is still 20 kg on the moon or even in deep space.

Jacob[/QUOTE]

The pound on the other hand, as Mark Rose correctly pointed out, is not a unit of mass.

[QUOTE=Dubslow;442396]The pound on the other hand, as Mark Rose correctly pointed out, is not a unit of mass.[/QUOTE][URL="https://en.wikipedia.org/wiki/Foot%E2%80%93pound%E2%80%93second_system"]The pound is a fine unit of mass.[/URL]

[QUOTE=sdbardwick;442411][URL="https://en.wikipedia.org/wiki/Foot%E2%80%93pound%E2%80%93second_system"]Some would disagree[/URL].[/QUOTE]

yeah well I argued about the poundal being force in physics and got told I was wrong so even physic teachers can disagree with that article.

[QUOTE=S485122;442379]The kg is a unit of mass and mass does not change with location. 20 kg on earth is still 20 kg on the moon or even in deep space.

Jacob[/QUOTE]

Exactly my point. It's the same in Canada as on the Moon. :)

[QUOTE=Mark Rose;442415]Exactly my point. It's the same in Canada as on the Moon. :)[/QUOTE]

really because mass increase is part of special relativity. does it not survive in general relativity ?

[QUOTE=science_man_88;442416]really because mass increase is part of special relativity. does it not survive in general relativity ?[/QUOTE]It survives, or not, exactly as it does in special relativity. The reason is that GR reduces to SR in sufficiently small regions of space time where the curvature can be neglected.

The mass increase in SR is entirely a matter of how you look at it. In the inertial frame in which the massive object is at rest its mass is its rest mass, by definition. In other reference frames the mass is greater than the rest mass.

By definition, the kilogram is the rest mass of a lump of metal stored in Paris. This definition may change in the near future but it will still be defined as the rest mass of something.