How to get the absolute zero from the graph for Charles law in Celsius?

Question

I plotted the data points, and I got this for Charles law: y = 1.1906x + 279.18 R² = 0.9619 I don't understand how I'm supposed to get the absolute zero I know that y=mx+c will be V=mT+c for Charles law Update: I saw somewhere how it got calculated and then I did this: -279.18/1.1906= -243.5

Answer 1

You can either extend your line until it intersects the x axis, i.e. volume is zero, or using the equation plug in 0 for V and solve for T. 

V = 1.1906 T + 279.18

0 = 1.1906T + 279.18

-279.18/1.1906 = T

T = -234.49 degrees K = absolute zero