define negative mass
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Negative mass is the hypothetical idea that matter can exist with mass of the opposite sign to the ordinary stuff.
Neero:
if we put a helium gassed balloon inside a car, and accelerate the car then the balloon will move front instead of back
because helium is lighter than air and opposes the motion of other heavier gaseous elements
helium or hydrogen gassed balloon
helium
because air consist of many heavier elements
and being the light gas it goes in the opposite direction of the air
no i mean it can be helium or it can even be hydrogen
yup hydrogen too
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