First we have to tell you what a constant is. Simply put, a constant is a number or measurement that is always the same. No matter where, when, or what condition, when you have a formula which asks for a constant, it is always the same number. Here are some examples... 

6.02 x 10^{23} NAME: Avogadro's Number WHAT: It tells you the number of atoms in a mole or the number of molecules in a mole of a substance. 

9.1x10^{31}kg NAME: Mass of an Electron WHAT: We talk about electrons spinning around the nucleus of an atom. Well the m_{e} is the mass of one of those electrons. 

1.675x10^{24}g NAME: Mass of a Neutron WHAT: In the nucleus of an atom there are neutrons and protons. A neutron has this much mass. 

1.673x10^{24}g NAME: Mass of a Proton WHAT: In the nucleus of an atom there are neutrons and protons. A proton a mass of this amount. 

6.63x10^{34}Js NAME: Planck's Constant WHAT: Max Planck figured out that energy can be gained and lost by an atom. He used this constant to figure out how much energy. The "J" stands for Joules. 

3x10^{8}m/s NAME: Speed of Light (in a vacuum) WHAT: Scientists figured out that light travels always at the same speed in a vacuum. The number is really 299,792,458 meters per second, but we abbreviate it. 

9.8 m/s^{2} NAME: Acceleration of Gravity of Earth WHAT: What if you drop a ball from a height? It speeds up as it falls. The amount it speeds up (acceleration) is because of gravity. 

1.66x10^{27}kg NAME: Atomic Mass Unit (also called a Dalton) WHAT: It is 1/12 the mass of a Carbon12 atom. It is the basis for figuring out the mass all other atoms. 

16.x10^{19}C NAME: Charge of an Electron WHAT: This is the charge of one electron which is flying around the nucleus. 

.082 Latm/molK 8.3 J/molK 1.987 cal/Kmol NAME: Universal Gas Constant WHAT: This constant is used in the Universal Gas Law "PV=nRT". It has the same value for all gases. You use a different value depending on what measurements your formula uses. 
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