A thin paper cup filled with water does not catch fire when placed over a flame. This is because

Seeds when placed in water swell because of

When water is poured over burning wood, the fire goes off. This is because

Rohan observed that if a small piece of sodium is added to water it catches fire whereas a piece of calcium added to the water it does not catch fire. Can you explain his observations with the help of the chemical equations?

Why sodium catches fire when dropped in water ?

Firemen wear dress which does not catch fire. How is it possible?

Why does a scented stick with burning stub does not catch fire when it is kept aside in air after putting its flame off?