That depends on the pressure and temperature of the air in the cubic meter. Any time you change the pressure or the temperature of a gas, you change the number of molecules in one cubic meter of it.
air has weight
One cubic meter always has 1000 liters, no matter what is inside. On the other hand, 6 bars is approximately 6 times the normal atmospheric pressure, so - according to the ideal gas law - the cubic meter of compressed air would be equivalent to 6 cubic meters of "normal" air.
The diaphragm is the organ that helps you breath 282 cubic feet of air that you need every day.
The answer will depend on the temperature and pressure.
2 cubic feet
6 lbs
Nothing
Air has a specific volume (cubic feet per pound) of approximately 13.8 (cubic feet per pound) at 78 degrees F and 50% relative humidity. The specific volume ranges from about 12.4 cubic feet per pound at 31 degrees F and 50% relative humidity to about 14.8 cubic feet per pound at 105 degrees F and 50% relative humidity. The specific volume varies as a function of temperature and humidity. ------------------------------------------------ The correct term is mass not weight. According to the International Standard Atmosphere at 15 oC and 760 mm col. Hg the density of pure, dry air is 1,225 kg/m3. So, a cubic foot has a mass of 34,7 g. For other conditions it is of course necessary to know the characteristics of air in the specified location and time.
1 cubic foot of air will support 62 lbs
2.065 pounds per cubic yard
The weight of air at sea level is approximately 0.075 pounds per cubic foot. One cubic yard is equal to 27 cubic feet, so the weight of air per cubic yard at sea level would be approximately 2.025 pounds.
The density of air at 25 degrees Celsius is approximately 1.184 kilograms per cubic meter at sea level pressure.
The weight of standard air is 1.2256 Kg/ Cubic Meter The weight of hydrogen is 0.0857 Kg/ Cubic Meter The weight of helium is 0.1691 Kg/ Cubic Meter Subtracting the weight of hydrogen from air gives you the gross buoyant lift of hydrogen as 1.1399 Kg/Cubic Meter Subtracting the weight of helium from air gives you the gross buoyant lift of helium as 1.0565 Kg/Cubic Meter These values are variable under altitude, pressure, temperature, humidity and purity of gas. Hope this helps you.
The weight of a cubic foot (cf) varies depending on the material. For example, a cubic foot of water weighs about 62.4 pounds. However, a cubic foot of air has a negligible weight.
About 2 pounds
It would depend on the contents of the cubic meter, 4 cubic meters of air would not have a measureable weight, and 4 cubes of sand/gravel would weigh considerably more.