A method we used at university is quite simple.
Take a very large inflatable ( we had a giant beach ball r = 3.5m).
Use a pump to extract all air from it.
Use precision scales top weigh the empty inflatable.
Fill the inflatable with "air" using a pump (not your mouth!!)
Again weigh the inflatable.
You should notice a slight increase in the weight of the ball.
It is possible to calculate the weight from the volume and the known values for the weight of air. This experiment is very basic and will never give you an accurate reading due to pressure on the ball when inflated etc.. but it is simple and shows something is there
Get a set of scales... they don't have to be extremely accurate, 0.1 or 0.01g accuracy should do.Then get a balloon, weigh it, and record the weightThen blow up the balloon, and weigh it again, it will be heavier... We did this experiment at school years ago
When finding the mass of air, you need to have a test tube and a stopper. Measure the mass of the test tube and the stopper together. Then, make sure that the air gets in the the tube and put the stopper on. Recheck the mass of the air, test tube, and stopper and subtract just the tube and stopper from the newly recorded mass to find the mass of air.
Anything with mass has weight; air has mass, therefore it has weight.
If the Gross Combination Weight Rating (the combined Gross Vehicle Weight Rating of the truck and of the trailer) is in excess of 26,000 lbs., you can use it to test for a Class A CDL. However, you'll receive an "L" ("no air brakes") restriction, which will prohibit you from operating a CMV equipped with air brakes (such as a tractor-trailer).
In the US, no - there is no such thing as an air brake endorsement - only a restriction for CDL holders who don't pass the written air brakes test and complete the pretrip and road tests in a vehicle equipped with air brakes, which prohibits them from operating vehicles requiring a CDL which are equipped with air brakes.
air has weight
What are the test answers to air field driving
You take the written Air Brakes test, and conduct your road test in a vehicle equipped with air brakes.
If you have gained weight or not have nothing to do with it. If you are pregnant the test will show.
Air has weight because it is made up of molecules that have mass. The weight of the air is due to the gravitational force pulling down on these molecules. The more air molecules present in a given volume, the greater the weight of the air.
You complete the written air brakes test, and perform your road test in a vehicle equipped with air brakes.
The weight of air is called atmospheric pressure. It is the force exerted by the weight of the air above a given point in the atmosphere.