That's just another way to write numbers in scientific notation. The other common way to express scientific notation is 1 X 1018, 1 X 1015, 1 X 1012, etc. All that means is that the number before the exponent is either followed by the number of zeroes in the exponent (if the exponent's positive), or proceeded by the number of zeroes in the exponent (if the exponent's negative).
In the sciences, the first several exponents that are non-zero multiples of 3 (both positive and negative), are given special prefix names. For example, 103 is kilo-, 109 is giga-, and 10-9 is nano-.
Below, I added a related link that gives many more examples of these special prefix names.
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Depends on what you do (or want to do) with it: shaking, heating, pumping, swimming in, etc. etc.
uranium, plutonium,etc etc
Pretty much any lipid. Oil, butter, grease, etc...
Oxygen is needed in the electron transport chain (ETC) to serve as the final electron acceptor. It combines with electrons and protons to form water, which is essential for the functioning of the ETC and the production of ATP. Without oxygen, the ETC cannot proceed, leading to a halt in ATP production.
milk etc....