Dumb question

[LMH]

Calor Gas

If the weight on the bottle says 7KG, does the (can't believe I'm asking this) weight of the gas weigh 7KG? If so, what is the combined weight of the bottle and the gas. I thought gas didn't weigh anything.

(I'm asking this on behalf of someone else) (smiley icon thingy).

LIsa

 

[Damian]

Lisa, the cylinder empty will weigh about 8 kilos, that is the Tare weight as stamped on the metal collar around the to of the cylinder.

The gas, as it is stored as a liquid, will weigh 7 Kilos.

The total weight of cylinder plus gas is about 15 Kilos.

 

[GrahamSouthBrum]

Lisa,

I cant belive you asked this question.

Graham W.

 

[LMH]

Thanks for the replies, I'll pass that technical info on........ (runs away and hides).

Lisa

 

[ProfJohnL]

Hello Lisa

As you have gathered from the previous replies gas does have a weight, Though strictly speaking it should be quoted as a Mass. All matter has mass, and its weight is only the force that the mass exerts due to gravity. It just so happens that because we relate everything to what we know here on planet earth you can consider an object weight to be the same value as its mass.

If your bottle of LPG weighs 15Kgf here on earth, if you were to take it to the moon and weigh it the bottle has not changed so its mass is still 15Kg but it would weigh about 2.5Kgf because of the moons lower gravity effect.

The gas does have mass, because as you use the LPG you use some of the mass, its weight reduces of what's left.

 

[Brum1]

Lisa,

I cant belive you asked this question.

Graham W.

I can believe it. She has asked many other silly questions in the past.