It all depends on who made the air rifle and the power plant that the rifle uses.
0.0765 pounds per qubic foot
18 foot/pounds 18 foot/pounds
1 pound of air is equal to approximately 0.08 pounds of water. This is because air is much less dense than water, with air having a density of about 0.075 pounds per cubic foot and water having a density of 62.4 pounds per cubic foot.
One cubic foot of air at sea level weighs approximately 0.08 pounds. Therefore, in one CFM (cubic foot per minute) of air, there would be approximately 0.08 pounds of air.
One cubic foot of air can float approximately 0.0807 pounds (or about 36.5 grams) of weight due to its buoyancy in a denser medium, like water. This is based on the average density of air at sea level, which is about 0.0807 pounds per cubic foot. In practical terms, this means that if you have a balloon filled with air that displaces one cubic foot, it can lift that amount of weight.
The weight that 1 cubic foot of air can support depends on the density of the air. At sea level and room temperature, 1 cubic foot of air can support approximately 0.08 pounds. However, this value can vary based on factors such as altitude and temperature.
it all depends on the condition of the rifle.
in general 180 $ is the minimum for a reliable rifle.
What condition is it in..
there is a power limit of 12 foot pounds most of them put out just under the limit you have to find one what fits your body they are all different sizes and weights pick the one you feel comfortable with
If you take the average weight of all of the molecules in one cubic foot of air and add them together you reach 0.0807 pounds. This number can fluctuate with temperature and variations in the composition in the air.
Don't put as much air in the rifle. If you have a dial to set the power then use it. As you shot the power drops. You can dry fire some PCP air rifles.