Answer:D. Ratio of oxygen/nitrogen
Explanation: the ratio will never change no matter the air pressure!
I will have to say that this statement is true
0 degree Celsius is equal to 272 k
So to convert C to k we need to add 273
To convert K to C we need to subtract 273
Chemists use beakers, flasks, burets and pipets to measure the volume of liquids. Plz mark as brainliest