Question

how will you show that air is essential for burning fuels

Answer 1

candle experiment, where we put a candle inside a upside down beaker, then candle stops burning inside the beaker as the oxygen runs out, this ensures that air is necessary for burning fuels

Answer 2

It consists of about 78% nitrogen, 21% oxygen, and about 1% of argon, carbon dioxide, and other gases — as well as varying amounts of water vapour. 3.How will you show that air is essential for burning fuels? ... While animals use that O2 for respiration and give out CO2 which is useful to the plants.