Well, honey, the external terms of a ratio are the first and last numbers in the ratio, while the internal terms are the second and third numbers. So if you've got a ratio like 2:5, the external terms are 2 and 5, and the internal terms are... you guessed it... 2 and 5. Math can be a real hoot, can't it?
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Oh, dude, external and internal terms of a ratio are just fancy words for the numbers that make up the ratio. The external term is the second number in the ratio, and the internal term is the first number. So, like, if you have a ratio of 2:5, 2 is the internal term and 5 is the external term. It's like the inside and outside of a math sandwich, but way less tasty.
If A is to B as C is to D, A and D are the external terms or the extremes of the proportion, and B and C are the internal terms or the means.
The processes of internal and external conversion differ by the method of energy loss. Internal conversion exploits the degrees of freedom within the molecule, whereas external conversion dissipates energy by collisions with other molecules.
Ratio
33.3% as a ratio in lowest terms would be 1:3
internal and external memory
174 over 203 as a ratio in lowest terms is 174 to 203 or 174:203.