Question

What is the shape of pv curve of a mass of given gas at constant temperature?

Answer 1

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ȯ In P-V graph of constant temperature pressure and volume are variables. But since temperature is constant the ideal gas law can be modified; PV= nRT. now here number of moles is constant ,R is gas constant , and the temperature is also constant.

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Answer 2

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• pv = nrt ( ideal gas equation)

• p. = nrt/v

• n is constant

• r is constant

• and t is also constant

• then,

• p = 1/v

• when p is increases then v is decreases

• it is rectangular hyperbola

• •so, do keep in mind that isothermal graph is not parabolic but actually hyperbolic.

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