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| the smallest component of an element having the chemical properties of the element; the number of protons determines the identity of the element |
| the amount of heat per unit time per area that can be conducted through a plate of thickness of a given material, differing by one unit of temperature |
| acceleration of gravity
The acceleration of a body falling freely under the influence of the Earth's gravitational pull at sea level. It is approximately equal to 9.806 m (32.16 ft) per second per second, though its measured value varies slightly with latitude and longitude. Also called acceleration of free fall. |