According to what I know, intensive physical properties are those that are not equal to sum of partial quantities, and extensive properties are the opposite, i.e number of moles is extensive, but temperature is intensive (we can’t say that mixing a 30C body with a 40C body would make temperature of the mix 70C obviously).
Accordingly, why do we say that total pressure is the sum of partial pressures (Dalton’s law of pressure) since pressure is intensive, just like temperature? Is it the fact that pressure=force/area, and by keeping the same area and applying different forces having the same directions, the forces sum up which makes pressures sum up? But if this was correct, why do we consider pressure intensive from the beginning?
I’m lost here.
In: 1
Intensive just means that it does not depend on the amount you measure, like you can measure the same pressure if you divide the container in two unequally sized parts and measure the same pressure, which is pretty easy to see
you can add more gas and the pressure will increase, but no matter how much of the volume i measure the pressure of, it’s still the same
if instead i were to measure the weight, then a smaller volume will necessarily weigh less
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