# I’m so confused can anybody help..?

### 2 Answers

- Donnie PorkoLv 78 months agoFavorite Answer
PV = nRT

Just look st the equation. If one is one one sude and the other is on the other side then they’re directly proportional.

P and V are on the left side of the = sign so they’re not directly proportional.

P and T are on opposite sides of the = sign, so they’re directly proportional.

You can tell if you keep the other variables the same. Let’s see if P and T are directly proportional. You keep V, n, R the same, so we’ll assign a random number of 2. Let’s make P = 5

5(2) = (2)(2)T

T = 2.5

If we change P to 3:

3(2) = (2)(2)T

T = 3/2

T went down when P went down so they’re directly proportional.

For inversely proportional, they’re on the same side of the = sign.

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- AlanLv 78 months ago
9.

Remember

PV = nRT

where P = pressure

V = volume

n = number of moles

T= Termperature

so rearrange the equation for each pair of variables.

Pressure and volume

P = nRT/V

so if nRT are constant , P=k/V

so pressure and volume are inversely proportional.

pressure and temperature

T = PV/nR

so if V/nR are constant

T = Pk

so pressure and temperature are directly proportional

Amount of gas and pressure

Amount of gas is related to n (number of moles)

n = PV/RT

so if V/RT are constant

n = Pk

so the amount of gas and pressure are directly proportional

amount of gas and volume

V = nRT/P

so if RT/P is constant

V = nk

so amount of gas and volume are directly proportional

Temperature and Volume

V = nRT/ P

so if n and P are held constant

V = kT

so temperature and volume are directly proportional

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