5. Explain why:- (a) Ice floats on water. (b) We sweat more on humid days. (c) A balloon kept in sunlight burst after sometime.
Answers
Answer:
Explanation:What's so special about ice that causes it to float? Believe it or not, ice is actually about 9% less dense than water. Since the water is heavier, it displaces the lighter ice, causing the ice to float to the top.
Answer:
a) There are vacant spaces between hydrogen bonded water molecules in ice. Ice has a cage like structure. Due to this reason ice is less dense than water . Hence, ice floats on water.
b) In humid days air around us already surrounded with water vapours. As a result sweat evaporates slowly and our body heats up. Hence, we sweat more on humid days.
c) A balloon when kept in sun bursts after sometime because outside temperature is high and due to kinetic energy increases and molecules of gas particles inside the balloon exerts a pressure on the walls of balloon. Due to this balloon expand and at a time balloon bursts.