1. Estimate the mass of air in kilograms in a classroom that has a [latex]200-m^2[/latex] floor area and a 4-m-high ceiling. (Assume a chilly 10°C temperature.) 2. Why doesn’t the pressure of the atmosphere break windows?

1. The mass of air is 1000 kg. The volume of air is [latex]200 m^2 \times 4m = 800 m^3[/latex] ; each cubic meter of air has a mass of about 1.25 kg, so 800 [latex]m^3 \times 1.25 kg/m^3 = 1000 kg[/latex]. 2. Atmospheric pressure is exerted on both sides of a window, so no net force is exerted on the window. If for some reason the pressure is reduced or increased on one side only, as in a strong wind, then watch out!

Question 6.S&C.7: 1. Estimate the mass of air in kilograms in a classroom that...

Conceptual Physics Fundamentals [EXP-51843]

1. Estimate the mass of air in kilograms in a classroom that has a 200- $m^2$ floor area and a 4-m-high ceiling. (Assume a chilly 10°C temperature.)

2. Why doesn’t the pressure of the atmosphere break windows?

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1. The mass of air is 1000 kg. The volume of air is $200 m^2 \times 4m = 800 m^3$ ; each cubic meter of air has a mass of about 1.25 kg, so 800 $m^3 \times 1.25 kg/m^3 = 1000 kg$ .

2. Atmospheric pressure is exerted on both sides of a window, so no net force is exerted on the window. If for some reason the pressure is reduced or increased on one side only, as in a strong wind, then watch out!