Why isn’t hydrogen gas used as a domestic or industrial fuel, although it has a very high calorific value? State three reasons for the answer.

When the clothes of a person catch fire, the person is covered with a blanket to extinguish fire, explain why?

Updated 1/12/2026

On putting glass over a lighted candle, the candle flame flickers and produce smoke, why so?

Updated 1/12/2026

Explain how water gets boiled in paper cup without burning it.

Updated 1/12/2026

Food is a fuel for the body. Justify this statement.

Updated 1/12/2026

What do you mean by ignition temperature? Why a matchstick dose not catch fire on its own at room temperature?

Updated 1/12/2026