Does light speed up or slow down when it travels from air to liquid

Slows down

Explanation:

light speed in liquid is 225,000,000 meters per second (74,792,458 meters per second slower than light speed in air

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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