When pressure decreases, what happens to the number of particles in a gas? Do the number of particles increase, decrease, or stay the same?
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If the pressure decreases but everything else (volume, temperature) stays the same, the number of particles must decrease. You can see this from the ideal gas law.
PV = nRT
If V, R and T are constant, then you have P = n or pressure is = moles (particles). As pressure goes up, number of particles goes up, an vice versa.
PV = nRT
If V, R and T are constant, then you have P = n or pressure is = moles (particles). As pressure goes up, number of particles goes up, an vice versa.