What determines how a star develops after the red gaint stage in its cycle?
what two things can happen in the life of a massive star after it passes from the supernova star?

After the red giant stage in its cycle, depending on its mass would determine how the star will end up. For stars greater than 1 solar mass but less than 2 solar masses, the hydrogen burning shell consumes its way outward leaving behind more helium ash. As helium piles up, the core becomes bigger and then contracts. By contracting, it becomes warmer to the point that the electrons degenerate. From gas, it will then become liquid becoming incompressible and further contraction stops.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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