When selling various substances that are prone to thermal expansion, it is necessary to set the conditions of measuring the substance's volume that every participant in the transaction can agree on$.$ This is especially important when buying gasoline at a gas station or measuring the natural gas consumption at your house. One common set of conditions is to measure the volume of substance at $15\backslash$deg C$.$

Let us say that you are buying petroleum at a gas station and your car needs $100$ L of gas $($volume calibrated at $15\backslash$deg C$).$ What volume would you moscuro if it were $-20\mathrm{.}0\backslash$deg C

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outside instead? $($Use B $=950\backslash$times $10-6$ K$-1).$