Why does air pressure in tyres go down?

George Michael

Hi

this is a question i couldnt find the answer to on google. Why does air pressure go down in tyres when there is no way for it to escape?

artanevilla

Where the tyre meets the rim isn't a perfect seal, it might be close, but not perfect, so air leaks out very slowly over time.

Also I believe tyre walls are pourous, so it leaks out here very slowly, again over a period of time.

I am open to correction on this though.

George Michael

artanevilla wrote: »

Where the tyre meets the rim isn't a perfect seal, it might be close, but not perfect, so air leaks out very slowly over time.

Also I believe tyre walls are pourous, so it leaks out here very slowly, again over a period of time.

I am open to correction on this though.

interesting.

Kenny Logins

Explained here.

https://www.youtube.com/watch?v=kmnZ4-EUbIk

George Michael

^^^ very interesting video.

the oxygen molecules can seep through the tyre. never would have thought of that

joujoujou

Hamsters.

They breathe.

So they use air off your tyres.