## Unit Conversions

Posts: 91
Joined: Fri Sep 28, 2018 12:16 am

### Unit Conversions

Within the SI Units, when converting is there a helpful reminder to remember the order of units, and is it sufficient to multiply to convert g to kg by multiplying by 10^-1 or must you simplify what the value truly is using the new units?

Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

### Re: Unit Conversions

I don't know if there's any type of mnemonic device for unit conversions, but here are some of the more common prefixes:
mega-(M) = 1 x 10^6
kilo-(k) = 1 x 10^3
deci-(d) = 1 x 10^-1
milli-(m) = 1 x 10^-3
micro-(lowercase greek letter mu) = 1 x 10^-6
nano-(n) = 1 x 10^-9
pico-(p) 1 x 10^-12

The letter in parentheses is what goes before the standard unit e.g. millimeter = mm, picometer = pm, etc.
Last edited by Matthew Tran 1H on Sun Sep 30, 2018 10:23 pm, edited 1 time in total.

Hannah Pham 1D
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

### Re: Unit Conversions

Remembering conversions generally just happens over time with practice through homework and classwork problems. To convert from g to kg, divide by 1000.

Albert Duong 4C
Posts: 66
Joined: Fri Sep 28, 2018 12:17 am
Been upvoted: 1 time

### Re: Unit Conversions

Another helpful tip is to remember that when going from small to large units (e.g. g to kg), the numerical value should do the opposite and get smaller (e.g. 1000 g becomes 1 kg).

LaurenJuul_1B
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

### Re: Unit Conversions

Here are a couple mnemonic devices that list the order from largest to smallest:

King Henry Doesn't Usually Drink Chocolate Milk (kilo, hecto, deka, unit, deci, centi, milli)
Kittens Hate Dogs But Do Chase Mice (kilo, hecto, deca, base, deci, centi, milli)
Good Models Know How Dunkin Donuts Can Make U Not Petit (giga, mega, kilo, hecto, deca, deci, centi, milli, micro (symbol looks like a “U”), nano, pico)

and here are what they correlate to:
giga-10^9
mega-10^6
kilo-10^3
UNIT (meter, ect.) 10^0
deci-10^-1
centi-10^-2
milli-10^-3
micro-10^-6
nano-10^-9
pico-10^-12

if you google mnemonic devices you can find some others as well! it just depends on how many you wish to remember