Stoichiometry
An ideal gas can be liquified, because

Its molecular size is very small
It gets solidified directly without becoming liquid
Forces operative between its molecules are negligible
Its critical temperature is more than 0°C

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Stoichiometry
Pick out the wrong unit conversion of thermal conductivity.

1 BTU/ft².hr.°F/ft = 1.488 kcal/m². hr.°C/m
1 BTU/ft².hr.°F/inch = 1.488 kcal/m². hr.°C/m
1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F

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