well mair=nM
where M=molar mass of air
so subbing into pV=nRT
gives mair=\frac{pVM}{RT}
Is this what you mean?
Can't really see how this is helpful though. Still leaves me with unknowns of p, \rho, and M after subbing into intitial equations.
How does using the molar mass of air, M...
Homework Statement
Estimate the required temperature of the air inside a (rigid) balloon in order for it to achieve lift off.
Volume 2000m3
\summass, mtot=920kg
Homework Equations
pV=NkT
p=\frac{Force}{Area}
\rho=\frac{m}{V}
The Attempt at a Solution
We require
Fup>(mair+mtot)g (assume...
Yeah, this was what I was trying to do! Thought i had solved it correctly and was just looking for confirmation. However I've now noticed I got a few dimensions confused. I'll try again...
Multiplying G and \hbar gives dimensions of L5T-3.
c-3 will have dimensions L-3T-3 (I believe?)
So...