Estimating absolute zero from formula P V = n R T

 big syringe with weights stacked on plunger
 to provide a consistent pressure on gas inside.

 Put in water at various temperatures; measure volume.
 Do several times; push on plunger - it can stick.

temp    volume
0	10.2
0	9.5
0	10.1
22	11
22	11.1
22	11.3
90	14
90	13.1
90	12.6

 1. What is your estimate of absolute zero?
 2. How much do you believe that number?

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 Need to know :
   - how to make a graph and stare at it
   - some ideas from linear regression
   - propogation of errors in formulas : percentage errrors add