1.21kg/m3 at 20 deg C at sea level
1.16kg/m3 at at 30 deg C
Depends how hot it is and at what altitude, it is not constant. Here is a rough idea.
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1 cubic foot of iron, at room temperature would weigh approx 2190 newtons.
At room temperature and 1 atmosphere, the mass of one cubic metre of water is 0.998 207 1 tons.
The room that you are in.
At 4 deg C and a pressure of 1 atmosphere, the mass is 0.999972 kilograms. At this temperature, water is at its most dense. At room temperature (20 deg C) the mass is 0.9982071 kg. The weight will, of course, depend on where on earth (or elsewhere) the weight is measured.
We can answer that, but the answer isn't simple. Try to stay with us here:First of all, it depends on the temperature, pressure, and humidity of the air.For dry air at a temperature of zero Celsius (32 Fahrenheit) and pressure of760 mm Hg, the density is1.2929 gram per liter = 1.2929 kilogram per m3 .The weight of 1.2929 kilogram is 12.67 newtons (2.85 pounds). (rounded)BUT . . . . .Don't forget that anything surrounded by a fluid is buoyed up by a force equal tothe weight of the displaced volume of fluid. So our cubic meter of air is buoyed upby a force equal to the weight of a cubic meter of air, and winds up weighing zero !Surrounded by vacuum, it weighs about 2.85 pounds. But surrounded by more air,it weighs exactly nothing.Which is why every cubic meter of air in the room doesn't fall down on the floor.