The name Luis is of Spanish and Portuguese origin. The meaning of Luis is famous warrior. Luis is generally used as a boy's name. It consists of 4 letters and 1 syllable and is pronounced Luis.
Key Concepts. 1  Heating a liquid increases the speed of the molecules. 2  An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. 3  Cooling a liquid decreases the speed of the molecules.
If you bring two bar magnets together, there are two things that can happen: if you bring a north pole and a south pole together, they attract and the magnets may stick together if you bring two north poles together, or two south poles together, they repel and the magnets push each other away.