Originally Posted by 09 harley
I would like you to reread the post. Apparently the physics part was just glossed over. Please give a more detailed explanation. I believe we all understand that hot air rises. Thatís the whole point. Also helium is lighter than sir. Thatís the whole point. The interaction between these two gases is the whole point. What part of my post do you not understand. I consider myself to be a good teacher and I would like the opportunity yo clear up any misconceptions you may have.
Class is now in session.
I fully understand the physics. That is how hot air balloons float. The large balloon is filled with enough hot air to over come the weight of the basket and occupants.
You can not get enough helium in your tires to lift the vehicle as you say. You are the one that does not understand, what you say is Impossible.
To lift your car would take a HUGE amount of helium. The amount in your tires is a change of weight of maybe 100 grams.
A quote from PHYSICS, "Helium is less dense than air. Helium has 0.0114 pounds per cubic foot. For a one cubic foot helium filled balloon , gravity pulls the down on the helium with a force of 0.0114 pounds while the air pushes up with a force equal to the weight of the air the helium displaced, or 0.0807 pounds. The difference in the up and down force is 0.069 pounds. Therefore each cubic foot of helium could lift 0.069 pounds. In order to lift 100 pounds (which would include the weight of your load, the balloon, and the helium) you would need 1449 cubic feet of helium. This would require a balloon with about a 15.5 foot diameter. If instead you used small spherical (one foot diameter) balloons (which holds about 0.526 cubic feet of gas), it would take over 2754 of them to lift the 100 pounds." That is 1449 cubic foot to lift 100 pounds. Physics. That would be A LOT OF GAS TO LIFT 4000 POUNDS.
Another article for you to read if you have to fill your tires with other than air, like nitrogen, which really isn't much better than air.
I'll keep filling with air and check-in pressure periodically and not worry about floating away. If you really think you can make your car tires with enough helium to float a little, then keep on dreaming.