What variable stays constant when using the combined gas law?

Answer 1

There is no single variable that never changes in the combined gas law:

#(P_1V_1)/T_1 = (P_2V_2)/T_2#

This rule applies only to an unchanged sample of gas (none added or removed), though, so the number of moles of gas remains constant.

I do wonder if the inquirer was thinking of the Ideal Gas Law:

#PV = nRT#
In that case, #R#, the ideal gas constant, remains constant, but may be expressed in different units.
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Answer 2

The number of moles of gas stays constant when using the combined gas law.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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