Solve Combined Gas Law: National 5 Physics Exam Help

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SUMMARY

The discussion focuses on the Combined Gas Law, represented by the formula P1V1/T1 = P2V2/T2, which is crucial for solving problems in National 5 Physics. A participant expressed difficulty in substituting values and rearranging the equation correctly. The solution involved practicing exam-style questions and ensuring temperature is converted to Kelvin to avoid negative values. Clarification from an instructor confirmed the importance of temperature conversion in gas law calculations.

PREREQUISITES
  • Understanding of the Combined Gas Law formula
  • Ability to perform unit conversions, specifically temperature to Kelvin
  • Basic algebra skills for rearranging equations
  • Familiarity with National 5 Physics curriculum
NEXT STEPS
  • Practice solving problems using the Combined Gas Law
  • Learn about gas law applications in real-world scenarios
  • Review unit conversion techniques, focusing on temperature
  • Explore additional gas laws, such as Boyle's Law and Charles's Law
USEFUL FOR

Students preparing for National 5 Physics exams, particularly those struggling with gas laws and equation manipulation.

CheesyPeeps
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I am studying National 5 physics, and my exam is tomorrow. I need some last-minute help.
I'm struggling a little bit with the combined gas law, P1V1/T1 = P2V2/T2, and I'm not sure why.
It would help me a lot if you could show step-by-step how the formula is used.
Thanks for your time, it's very much appreciated.
 
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CheesyPeeps said:
I'm struggling a little bit with the combined gas law, P1V1/T1 = P2V2/T2, and I'm not sure why.

Where exactly are you having problems with it?
 
Drakkith said:
Where exactly are you having problems with it?

That's the problem: I'm not sure where things are going wrong. I think it may be when I substitute in the values and then have to rearrange the equation, which seems strange because usually rearranging equations is the easiest part!
 
I'd suggest finding a homework question and posting it in the homework forums, that way the homework helpers can walk you through it and find out where you're having trouble.
 
Okay!
Thanks a lot for your time.
 
I'm sure I'll stop by your thread later, as we are studying the gas laws in class this week. :wink:
 
Update: I did some exam-style questions on it and I've got it now! I think it was a mixture of me overcomplicating it and occasionally forgetting to convert the temperature into kelvin :smile:
 
CheesyPeeps said:
and occasionally forgetting to convert the temperature into kelvin

Yes, I just clarified this with my instructor tonight. Makes sense, otherwise you end up with negative numbers when your temperature goes below zero!
 

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