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A dieting person loses weight.
a closed system will not gain or lose mass
it loses mass! and actually it gains weight because of its mucles Actually you only gain weight with muscle mass if you exercise, therefore increasing the muscle mass.
If by space you are referring to volume, then NO. Matter doesn't lose a considerable amount of mass when it changes volume. See: Law of Conservation of Mass. However, if the volume increases and the mass does not the density of the object decreases. Summary: No. It doesn't lose mass. But it does lose density.
number 1. of course they can what do you think they are going to lose hair? err no number 2. nobody likes a smart ass. mass is only used in scientific measurments. when dieting and in the real world it's called weight
if anything it would be reasonable to expect it to lose mass.
uh
No the heart does not lose mass.
No, it actually gains mass.
no
I highly recommend reading up on the Atkins induction (week one) phase on Atkins.com. You can lose 10 lbs. in a week or two and not lose muscle mass.
Mass can't just appear out of nothing, or disappear into nothingness. The only way for an object to lose mass is for part of the mass to go somewhere else - for example, if you chip away a piece of a block of wood, its mass will decrease, but the missing mass is still somewhere out there.