0 Kelvin is absolute zero; Water Ice melts at 273 K (= 00C = 320F); Water boils at 373 K (= 1000C = 2120F).

German astronomer and mathematician. Considered a founder of modern astronomy, he formulated the famous three laws of planetary motion.

= 1000 grams = 2.2 pounds, the mass of a liter of water.

= 1000 meters = 0.62 miles.

The energy of motion; equivalent to one-half an objects mass multiplied by its velocity squared.