Other Piece1

# Other Piece1 - Recall from the discussion about how energy...

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Other Pieces Other basic physical principles are put into the mathematical models: Continuity of Mass : the total stellar mass = sum of all of the shell layer masses. Mass is distributed smoothly throughout star's interior (there are no gaps or pockets of ``negative'' mass). Also, the law of the conservation of mass says that the total amount of mass does not change with time. Continuity of Energy : the amount of energy flowing out the top of each shell layer in a star = the amount of energy flowing in at bottom of the shell layer. No energy is magically destroyed or created from nothing. A star's luminosity = sum of all of the shell layer energies. Also, the law of the conservation of energy says that the total amount of energy does not change with time. Energy can change from one form to another form of energy, but the total amount is a constant. Energy Transport
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Unformatted text preview: : Recall from the discussion about how energy flows in planetary atmospheres that energy moves from hot to cold via conduction, radiation, or convection. Nature will first try to use radiation (photons) to move energy from the very hot interior to the very cold space. If radiation cannot transport all of the energy over the distance from the center to the surface of the star, then nature will also use convection. Convection is the bulk motion of gases used to transport energy. Hot gases rise to the upper levels and radiate their extra energy at the upper levels while cooler gases sink to pick up more energy from the hot interior. Conduction transports energy by having each atom transfer its energy to the atom next to it. Conduction is not an efficient process in a gas so it transports a very small amount of energy in stars and is usually ignored....
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