E46Fanatics - View Single Post - [Cooling System Upgrade] 1-BAR Radiator Cap
View Single Post
Old 10-04-2012, 07:30 PM   #53
Registered User
Join Date: May 2007
Location: TX
Posts: 4,093
My Ride: 330i
Originally Posted by WDE46 View Post
I don't know where you got this number. Did you assume a 1 atm starting point at 25C for this and calculate the change in pressure given the same volume but higher temperature?

I mean did you do: P1/T1 = P2/T2
I used ideal gas law: PV=nRT. V is the volume, n is the amount of air that occupies the V. R is the gas constant, and T is temperature. Air is an ideal gas.

One also needs to know that 1 mole of gas occupies 22.4 L of space. No need to assume a starting point. Just plug in the numbers and solve for P.

Sent from my SGH-I997 using Bimmer App
Black Sapphire MetallicNatural BrownSilver Cube e46 330i ZHP/6MT - Sold
HellrotDove Grey e36///M3 - RIP
Black Sapphire MetallicNevada BrownDark Bamboo e70 X5 xDrive4.8
Alpine WhiteCoral RedAluminum f30 328i Sportline/6MT
Imola RedBlackBlack Aluminum e46 330i ZHP/6MT
SeanC is offline   Reply With Quote