What is the deferent between expansion and contraction​

The increasing in size of an object on heating is called expansion where the decrease in size of an object on cooling is calles contraction.

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

as technology advances, new experiments often expose problems in accepted theories. c

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-lavira: )