# Atmospheric reentry drag and friction

What is the difference of air drag in ground level with let say moderate speeds like fast cars 200km/h to 400km/h with high speed vehicle reentry at high altitude where the air is so rarified. Making more simple is: {Low speed ( up to 0.5 mach ) + ground level air pressure )} ****versus**** { High speed ( 6- 7 km/s + air density at Kármán line.

Density at the Karman line is 1/2,200,000 that of ground level, so an increase from 0.5 mach to 7 km/s will feel roughly $$\frac{(7000/170)^2}{2200000}=0.00077$$ times the amount of drag. So, the same object in LEO would feel less than 1 tenth of 1 percent of the drag of the same object speeding along the ground.