How many moles are there in:
56.4 l of helium gas (he) at stp

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Light waves travel than sound waves.