In graphs of boyle's law, it is written that value of K is variable for each curve in the same graph. How is that possible?

Dear Student

Boyle's constant, k depends on the temperature of the gas, amount of gas, and the units in which the pressure and volume are expressed.

Under isotherm, the pressure and volume relationships is observed at constant temperature, which shows different curves due to the change in the values of pressure and volume.

Regards

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k is a variable because of the different curves made. Under isotherm, pressure is inversely proportional to  volume. so as volume increases, pressure decreases and vice versa. This is the reason why value of K is variable for each curve in the same graph.
 
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