Discussion
Read the following statements :
A. Hot air always rises up.
R. Hot air is denser.
Choose the correct option.
Answer: C
A is correct and R is incorrect, so the answer is A is correct but R is incorrect.
When air is heated it expands, so the same mass occupies more space. Its density falls, and the lighter warm air rises while cooler, denser air sinks and flows in to take its place. This is how convection currents and land and sea breezes form.
So hot air is less dense than cold air, not denser, and R is false. Because R is false, it cannot be the explanation of A, which rules out the first two options. A itself is the familiar fact behind hot-air balloons, so 'A is incorrect' is also wrong.
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