To consider absolute zero, let’s mention an ideal gas. If you’ve ever taken chemistry, you’ve probably heard of something called an ideal gas. An ideal gas is a simplified model to describe how gas molecules act. It treats them as essentially like billiard balls. So if you’ve played pool (or taken physics) you’ve got a handle on that. (BS Alert: they’re like billiard balls with zero size. But we digress …)
The equation you derive for this is PV=nRT, which kind of shows you that “pressure and temperature of an ideal gas are proportional to each other.” If T goes up, P goes up. If you don’t like math or equations, you can still totally understand this:
Temperature makes the balls move faster
Pressure is cause by them hitting the walls of the box they’re in
So, totally non-math: if they go faster, they hit harder. Easy, right? If T goes up, P goes up. 
Don’t do this, but if you throw an old canister in a fire it will explode. Because the billiard balls inside go so fast they blow the canister open. (And the billiard balls are the gas molecules, like air molecules.)

To consider absolute zero, let’s mention an ideal gas. If you’ve ever taken chemistry, you’ve probably heard of something called an ideal gas. An ideal gas is a simplified model to describe how gas molecules act. It treats them as essentially like billiard balls. So if you’ve played pool (or taken physics) you’ve got a handle on that. (BS Alert: they’re like billiard balls with zero size. But we digress …)

The equation you derive for this is PV=nRT, which kind of shows you that “pressure and temperature of an ideal gas are proportional to each other.” If T goes up, P goes up. If you don’t like math or equations, you can still totally understand this:

  • Temperature makes the balls move faster
  • Pressure is cause by them hitting the walls of the box they’re in

So, totally non-math: if they go faster, they hit harder. Easy, right? If T goes up, P goes up. 

Don’t do this, but if you throw an old canister in a fire it will explode. Because the billiard balls inside go so fast they blow the canister open. (And the billiard balls are the gas molecules, like air molecules.)