Answer:
Diffusion in gases
Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions
Explanation:
hope this helps
Biogas is not a fossil fuel
I believe the answer would be 3( conserved)
Atmospheric pressure is measured using a barometer.the pressure isnt the same everywhere on earth but it would depend on the height of the location