|Feb6-08, 10:47 AM||#1|
Ideal gasses and the law
1. The problem statement, all variables and given/known data
I have a ballon on the ground, where it is 20 degrees celcius, and it has a volume of 5L (it is filled with helium). The pressure at the ground is 1 atmosphere. The ballon itself (without helium) weighs 0.1 kg.
I find the force that makes the ballon go up to be:
F_up = (m_air)*g = 58.96 N
F_down = (m_Helium + m_ballon) * g = 9.13 N
So the ballon will go up.
I can also find the number of Helium-moles from n = m/M, and I find that n = 207 moles.
3. The attempt at a solution
My questions are:
As the ballon goes up, the pressure goes down and so does the temperature. I want to know, which parametres are affected by this?
The density of the helium? Yes, because density is written as "rho" = M*p/(R*T), so this changes.
The volume of the helium? yes, this changes as well.
The number of helium-moles? No, this is constant too.
The mass of the helium? Yes, this gets smaller when the temperature goes down since "rho" = m/V.
The pressure inside the balloon? No, this stays the same.
Can you guys please confirm this?
|Feb6-08, 12:24 PM||#2|
- the pressure of the balloon is constant also, right?
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