Buoyancy II

If you wanted to move a heavy rock across the bottom of a shallow pool, would it be easier to move it if the pool was empty or full of water?

The rock would be easier to move if there was water in the pool. The reason, buoyancy force.
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Charles' Law

Three parameters used to describe the characteristics of gases are pressure, volume and temperature. The ideal gas laws describe the behavior of gases with respect to these parameters. Boyle’s Law describes the relationship between the volume and pressure of a gas when temperature is held constant. Charles' law describes the relationship between temperature and volume when pressure is held constant.

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Specular vs Diffuse Reflection

Light is central to our experience of the world. Without its reflective properties, our eyes would not work. When we look at an object, the light rays entering our eyes are ones that have reflected off of the object. Our ability to determine the location and distance of the things we see stems from the fact that light rays behave in predictable ways.
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