High School

At 20 degrees Celsius, would there be more, less, or the same mass of air in a room at 0 degrees Celsius?

A. There would be more mass of air in a room at 0 degrees Celsius than at 20 degrees Celsius.
B. There would be less mass of air in a room at 0 degrees Celsius than at 20 degrees Celsius.
C. There would be the same mass of air in a room at 0 degrees Celsius as at 20 degrees Celsius.
D. The mass of air in a room at 0 degrees Celsius would increase as the temperature decreases.

Answer :

Final answer:

The mass of air in a room would be the same at 0 degrees Celsius as at 20 degrees Celsius, according to the ideal gas law. However, the density of air would change due to the different temperatures.

Explanation:

The correct answer is C. There would be the same mass of air in a room at 0 degrees Celsius as at 20 degrees Celsius. The mass of air is not affected by temperature, as long as the volume remains constant. However, at different temperatures, the density of air changes. As the temperature decreases, the air molecules move slower and occupy less space, resulting in a higher density. Conversely, as the temperature increases, the air molecules move faster and occupy more space, resulting in a lower density.

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