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Why ice is lighter than water? Hydrogen bonding gives ice a rather open structure with wide holes. Thus for same volume of water and ice , ice has less mass so it is lighter than water.
Helium is lighter than air. Youâll usually hear the phrase, âhelium is lighter than air,â but thatâs not entirely accurate. Itâs actually more appropriate to say that helium is less dense than air. Thatâs because helium molecules are not packed together as densely as air molecules are. It is this simple reason that helium balloons float in the air. Itâs also the key to understanding why helium balloons deflate faster in cold air. Answer: They donât. Yes, itâs true that your helium balloon may have shriveled up and is now resting on the cold floor instead of floating in the air.