Each cubic meter of air on Earth contains about 10 trillion trillion molecules. This falls to around 4 trillion trillion at the top of Mount Everest. A hundred kilometers up, sometimes considered to be the border of space, there are around a million trillion molecules per cubic meter.
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.
Depends on what the cubic meter is made of. A cubic meter of air will be something entirely different from a cubic of water.
That depends on the mass, pressure, and temperature of the air in the cubic meter.
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.
Approximately 1 cubic meter of LPG is equivalent to about 580-600 liters at standard temperature and pressure.
1000 cubic meters of air is equivalent to 1000 normal cubic meters of air. The term "normal cubic meters" (Nm^3) is typically used to represent gas volumes adjusted to standard conditions of temperature and pressure (usually 0 degrees Celsius and 1 atmosphere pressure). In this case, since both the given volume and the normal volume are in the same units (cubic meters), they are equal.
As many as you want, if you're willing to wait long enough.
Because it doesn't say neither the temperature, the pressure or the humidity of the air. You need to know both the temperature, the pressure and the humidity of the air to say anything about the mass of one cubic meter of air.
The quotient of (its absolute temperature)/(its pressure) decreases by half.
1300 gram
Measures the amount of air to flow past the meter in cubic feet (CFM) or meters (CMM) per minute.
The lead is more dense. Just so you know the volumes listed before each material are irrelevant - each one theoretically has a constant density no matter how much of it there is.