Air density decreases with increasing altitude, as does air pressure. It also changes with variances in temperature or humidity. At sea level and at 15 °C according to ISA (International Standard Atmosphere), air has a density of approximately 1.225 kg/m3. The addition of water vapor to air (making the air humid) reduces the density of the air, which may at first appear counter-intuitive. This occurs because the molecular mass of water (18 g/mol) is less than the molecular mass of dry air.
To calculate the density of air as a function of altitude, one requires additional parameters. They are listed below, along with their values according to the International Standard Atmosphere, using the universal gas constant instead of the specific one:
· sea level standard atmospheric pressure p0 = 101.325 kPa
· sea level standard temperature T0 = 288.15 K
· Earth-surface gravitational acceleration g = 9.80665 m/s2.
· temperature lapse rate L = 0.0065 K/m
· ideal (universal) gas constant R = 8.31447 J/(mol·K)
· molar mass of dry air M = 0.0289644 kg/mol
To calculate the weight of air in a room you need to know more than the dimensions of the room. So the 'correct' answer is impossible to know. Either that or the person who asked the question didn't understand the question they were asking!
All you need to do is multiply the length by the width, and it doesn't matter in what order you do it. 20ft X30ft= 600 square feet.
18ft*20ft = 360 square feet
450
120
10ft x 6ft = 60 sq ft = 5.57 sq metres, approx.
All you need to do is multiply the length by the width, and it doesn't matter in what order you do it. 20ft X30ft= 600 square feet.
To get the answer multiply length and width. The answer will come out to be 1,152 square feet.
A 30ft x 14ft room = 420 square feet.
18ft*20ft = 360 square feet
450
10ft X 10ft = 100sq ft /9 = 11.11 sq yds
120
Multiply 20x26.
10ft x 6ft = 60 sq ft = 5.57 sq metres, approx.
30
The answer depends on how big each square is.
7*10 = 70 square feet