extra: units

basic units and prefixes

Units for three SI base quantities

Quantity	Unit Name	Unit Symbol
Length [L]	meter	m
Time [T]	second	s
Mass [M]	kilogram	kg

Some prefixes for SI Units that you must remember!

Factor	Prefix	Symbol
10^9	giga-	G
10^6	mega-	M
10^3	kilo-	k
10^{-2}	centi-	c
10^{-3}	milli-	m
10^{-6}	micro-	\mu
10^{-9}	nano-	n

exponent rules

volume and surface area

1 horse-sized duck or 100 duck-sized horses?