They are different prefixes for amounts less than unity:
kilo = 1/1000
micro = 1/1,000,000
nano = 1/1,000,000,000
pico = 1/1,000,000,000,000
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nano watt
0.5 micro gram = 0.5 x 1000 = 500 nano grams. Hence 779.4 nano grams is greater than 0.5 micro grams by 279.4 nano grams
Millisecond.
"milli-" = 1/1,000 (thousandth) "micro-" = 1/1,000,000 (millionth) "nano-" = 1/1,000,000,000 (billionth) "pico-" = 1/1,000,000,000,000 (millionth of a millionth, "micro micro-")
milli is 10^3 bigger then micro. milli is 10^6 bigger then nano. milli is 10^9 bigger then pico.