How do scientists forecast space weather and why

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).

Scientist think that animals with remarkably similar embryo development probably shared a common ancestor

What physical property of gold makes panning a useful way to get gold from streams?