What records the difference between still air and air that is being rammed into the system?

Still air is at atmospheric pressure and atmospheric temperature whereas rammed air has a higher pressure, higher density than the atmosphere and as a result, its temperature also increases.

Explanation:

c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)

i think the answer is tomato juice? not entirely sure though