Gay Lussac's Law

A third gas law is the relationship between pressure and Kelvin temperature, Gay Lussac's Law:

P / T = P / T

Again, the temperature must be in Kelvins!  There cannot be negative or zero temperatures, so the Kelvin scale is used.

Kelvin = Celsius degrees  +  273

Here's a problem solving video:

Notice that he includes unit cancellation in his solution -- the units are very important!

I never performed a classroom lab based on this gas law, but here is a cute demonstration:

Here is another demonstration I did perform:

Notice that both videos are by students -- I wonder if a teacher had an assignment relating to the gas laws and uploading a video to YouTube was an option -- or it was extra credit.

BTW, Kelvins are not reported with degrees (as the student did) -- it's an easy mistake to make.

Many labs use calculator-based pressure sensors -- not everybody has access to that, so I'm not posting those type of labs here.  If your department has them, your department probably has a lab procedure that already has been used.  If not, here's your chance to set a precedent!  Go  for it!

And, check out my lab book "Chemistry on a Budget"  at:
http://www.amazon.com/Chemistry-Budget-Marjorie-R-Heesemann/dp/0578129159/ref=sr_1_1?s=books&ie=UTF8&qid=1389410170&sr=1-1&keywords=chemistry+on+a+budget

Each lab is presented with two possible report formats -- both with the same procedure -- one with 10 questions to be answered as a conclusion, the other with a full laboratory report required.  This was to give the teacher the option of what type of report is desired!

*I'd love to hear about your experiences or if you have ideas for other topics for this blog.

Have a good week!