Stage in a star's evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into space

The most efficient way to establish the best possible economizer position is to measure

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?