What does it mean that temperature and pressure vary directly?

Answer 1

As temperature goes up, pressure goes up.

As temperature goes down, pressure goes down

Answer 2

To "vary directly" means that when one goes up the other goes up, too. If one goes down, the other goes down.

Picture a balloon filled with air and tied. If it is warmed, the balloon will increase in size because the pressure inside went up. If it is cooled, the balloon will decrease in volume because the pressure inside went down.

Answer 3

That they are directly proportional. Example: For each pound of pressure, water needs another 2 degrees to boil. So under 50 pounds of pressure, water will have to be 100 degrees hotter than 212 degrees. (It would have to be heated to 312).

So: 1 lb. pressure = 2 degerees F as it relates to the boiling point of water.

Answer 4

It means when one of them increases the other increases too, or if one of them decreases the other is decreasing too!
so it means in a constant volume, if you make a change in temperature, you will have a similar change[increase or decrease] in pressure.
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