In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.
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The given linear equation is:

Determine the value of a and b (constants) by plug in the values of pressure and temperature.
(Pressure of liquid nitrogen) =
(Temperature of liquid nitrogen) =
(Pressure of ethyl alcohol) =
(Temperature of ethyl alcohol) =
Put above values in given equation:

(1)

(2)
Subtract equation (1) from equation (2), we get the value of b


Now, put the value of b in equation (1)


Now, at absolute zero, Pressure is equal to zero.
Absolute temperature = 

= 
Thus, absolute zero = 