Splung.com Physics Forum Forum Index Splung.com Physics Forum
Discuss physics or ask questions. Part of the Splung.com physics web site.
 
   SearchSearch   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Find the height that a balloon rises.

 
Post new topic   Reply to topic    Splung.com Physics Forum Forum Index -> Physics Help. Ask a Physics Expert
View previous topic :: View next topic  
Author Message
chemman218



Joined: 16 Sep 2012
Posts: 1
Location: RALEIGH

PostPosted: Mon Sep 17, 2012 8:02 pm    Post subject: Find the height that a balloon rises. Reply with quote

How high will a hot air balloon rise if the temperature inside is maintained at 345 K? Assume that the ambient temperature is 300 K. Assume that the pressure inside and outside are the same, but the density inside is reduced by heating. It is convenient to reference the calculation to the temperature of the atmosphere T0 = 300 K. This temperature corresponds to the density at sea level. To what height does the air balloon rise?

The Barometric Pressure formula is P=P0exp-(Mgh/RT)
Average molar mass of atmosphere is 0.029 kg/mol

I solved for H in the equation using P as 1.15 atm.
I used 1 atm for P0.
I used the fact that Pi/Ti=Pf/Tf to solve for P
The R value that I used was 8.314 J/(mol*k)

The H value that i got was 1410 m. This was not correct. Any help to where I might have messed up would be greatly appreciated.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Splung.com Physics Forum Forum Index -> Physics Help. Ask a Physics Expert All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


© Copyright 2010 Splung.com