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.
1 Conclusion: some force called a chemical bond must successfully hold atoms together. 2  It takes energy to pull us (and therefore chemical bonds) apart. Burns or sports injuries testify that this can happen.  The obvious force/energy holding atoms together is electrical attraction between opposite charges.