What's the difference about fat and soap so that people use them as such different ways

a soap, in essence, is the salt of a fatty acid. a soap molecule consists of a polar ionic hydrophilic end (“water-loving' end) and a nonpolar, hydrophobic end (“water-hating” end). when soap is mixed with water, its molecules arrange themselves in the form of roughly spherical aggregates of 60 or so molecules.

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output?

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what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.