Question

d. Why do firemen crawl on the floor that is filled with smoke, while
putting out fire?​

Answer 1

Answer:

A the smoke and heat is warm, it rises up and the lower gases like oxygen in the atmosphere takes the place left by the smoke. The lower you can get, the cooler it is and clearer you can see. Thus, a fireman crawls on the floor of a room that is filled with smoke

hope it hels you

Answer 2

Answer:

All the heat and smoke goes up, as it is warmer, and warm things are less denser. Whereas, oxygen is heavier and settles down- this gives them easier visibility and helps them breathe well. This is why firemen crawl on the floor when there is a fire.