Temperature and Pressure Calculation

[Phil31]

Hi there,

New to the forum.

I decided to come here as I am currently working on a formula that will give me the resulting pressure as a result of an increase in temperature within fixed volume.

I have used Charles Law and Boyles law and combined them in a way that gives me this increase.

Firstly, I was wondering if this is anything new, I couldn't find anything exact when researching it so used Charles Law and Boyles law to come up with it

Secondly, Is this useful? I know it is for me but in a general physics application?

So far it has held up to tests (that have not been all that scientific but as accurate as possible given my limited resource).

The formula is:

Where x is temperature increase in Celcius

P2 = P1 - (P1 x V1 x T1)/(x+T1)xV1

P is in Pascals
V in any metric unit
T is in kelvin

A bit about me, I have a Degree in Marketing and Economics but work in the Gas Industry.

Any feed back would be appreciated

Cheers

 

[BvU]

Hello Phil,

Good sleuthing, but not concerning

I couldn't find anything exact when researching

try 'ideal gas law' and 'equation of state'

hyperphysics is also very instructive

 

[nasu]

Hi there,

New to the forum.

I decided to come here as I am currently working on a formula that will give me the resulting pressure as a result of an increase in temperature within fixed volume.

I have used Charles Law and Boyles law and combined them in a way that gives me this increase.

Firstly, I was wondering if this is anything new, I couldn't find anything exact when researching it so used Charles Law and Boyles law to come up with it

Secondly, Is this useful? I know it is for me but in a general physics application?

So far it has held up to tests (that have not been all that scientific but as accurate as possible given my limited resource).

The formula is:

Where x is temperature increase in Celcius

P2 = P1 - (P1 x V1 x T1)/(x+T1)xV1

P is in Pascals
V in any metric unit
T is in kelvin

A bit about me, I have a Degree in Marketing and Economics but work in the Gas Industry.

Any feed back would be appreciated

Cheers

What is P2 in your formula?

 

[Phil31]

What is P2 in your formula?

P2 is the the New Pressure as a result of the temperature change.

 

[nasu]

Then you have a problem. It seems that if x=0 (so no change in temperature) the final pressure is zero.

 

[Phil31]

Then you have a problem. It seems that if x=0 (so no change in temperature) the final pressure is zero.

That would be correct as no change in temperature will mean no change in pressure as there is no expansion (or contraction) of the gas. The formula calculates the effect of temp on pressure in a vessel.

 

[Phil31]

That would be correct as no change in temperature will mean no change in pressure as there is no expansion (or contraction) of the gas. The formula calculates the effect of temp on pressure in a vessel.

My mistake i see wgat you are saying now will check that

 

[Phil31]

Then you have a problem. It seems that if x=0 (so no change in temperature) the final pressure is zero.

Just checked and you end up with P2 being equal to p1. Am i missing something?