Recent content by nour naser

i want to know about the denisity of air and how does it exchange ... to use it in equation ...and the denisity of helium ... and how much do we need helium ( i mean volume ) to elevate 1 kg weight ... thank u sooo much

hii... i need to know about materials that we can use in airships using helium ... i mean material which has these properties : 1) less penetration to helium 2) elastic 3) implement high pressure 4) resistance for heat 5) insulate the helium from the outer temperature ... thank u soo much for...