Question

A dining hall has dimensions 50m × 15m × 3.5m. Calculate the mass of air in the hall. Given, density of air =1.30kg/m3

Answer 1

volume = lbh

vol. = 50×15×3/5

vol = 2625m³

Since , D = M/V

1.30 × 2625 = M

M = 3412.5 kg

Answer 2

Volume of Air = Volume of Dining hall = l×b×h = 50 m × 15 m × 3.5 m = 2625m²
Density of air = 1.30 kg/m³ (=mass/volume)
∴ Mass of air in hall = Density of air × Volume of air
                                =  1.30 kg/m³ × 2625 m² = 3412.5 kg