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It doesn't matter whether your volume changes when you fart; 1 kg of feathers occupies much more volume than 1 kg of lead but still weighs the same.There's also the issue of buoyancy to consider, for we generally measure our 'weight' in the Earth's atmosphere, so the reason we might gain weight by farting is because we become less buoyant in air after losing the methane. If we were to measure our weight after farting in a vacuum then we would lose weight because the buoyancy issue doesn't apply.
If your volume changes wouldn't that alter your displacement in a fluid and alter your weight.
Quote from: Geezer on 12/09/2010 18:11:28If your volume changes wouldn't that alter your displacement in a fluid and alter your weight.Yes Geezer, it would, which is why I said you should also consider buoyancy as, in general, we weigh ourselves in a fluid/atmosphere. However, I was being pedantic too, and was trying to allow for the highly improbable case of weighing yourself in a vacuum, hence the two different answers.
A kilogram is a measure of mass, not weight.
Quote from: Geezer on 13/09/2010 18:15:36A kilogram is a measure of mass, not weight....and weight is a measure of force acting upon a mass...
Right. So does 1kg of feathers weigh the same as 1 kg of lead? (when weighed at STP on Earth.)
Quote from: Geezer on 14/09/2010 19:07:29Right. So does 1kg of feathers weigh the same as 1 kg of lead? (when weighed at STP on Earth.)If you do so by weighing them then they'll weigh the same.