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# Boyle's law help???

well , from what i understood , boyle's law states that if the amount of gas states the same , at the same temperature , the pressure increases as the volume decreases , and vice versa.

well , think about it , if you insert air in a bike's tire, you are applying more pressure and that tire gets bigger , so the volume increases.

why does boy'e law say that they are inversible?

### 1 Answer

- pisgahchemistLv 77 years agoFavorite Answer
Nix the "blowing up a bicycle tire" as an example of Boyle's law. The most important hole in your thinking is that when you pump up a tire, you are ADDING air molecules, the amount of gas is NOT fixed.

To model Boyle's law you can use a gas trapped in a syringe which has been sealed shut so that no air can enter or leave (or is connected to a pressure sensor, which also seals it). As the volume is increased and decreased, the pressure is inversely proportional. Decreasing the volume, increases the pressure. Increasing the volume decreaes the pressure.

Again, when you increase the pressure in the bicycle tire and the volume increases it is because you are adding more air molecules.

PV = nRT

PV = nk ..... assuming T is constant. As you can see, both P and V are directly proportional to n, the number of molecules.

Boyle's law.

PV = k ...... assuming T and n are constant. P and V are inversely related to each other.