Show Menu
Cheatography
  1. Home >
  2. Education >

Unit Conversion, Dimensions & Measurement Cheat Sheet (DRAFT) by

For Thermo, send help pls

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Fundam­ental or Base Quanitites

The quantities which do not depend upon other quantities for their complete definition are known as fundam­ental or base quantities.
e.g.: length, mass, time, etc.

Derived Quantities

The quantities which can be expressed in terms of the fundam­ental quantities are known as derived quantities.
e.g.: Speed = distan­ce/­time, Volume = length­*br­eadth

Units of Physical Quantities

The chosen reference standard of measur­ement in multiples of which, a physical quantity is expressed is called the unit of the quantity.
e.g.: Physical Quantity = Numerical Value x Unit

Length Conversion

Metric to American
2.54cm
1in
American
12 inches (in)
1 foot (ft)
3 feet (ft)
1 yard (yd)
220 yards (yd)
1 furlong (fur)
8 furlongs (fur)
1 mile
1 mile
1760 yd, 5280 ft, 63360 in

Mass Conversion

Metric to American
1kg
2.2046lbs
1g
0.0353oz
American
1oz
16dr
1lb
16oz
1cwt
100lbs
1ton
20cwt, 2000lbs
1tonne
1000kg
 

SI Base Units

Base Unit
Unit
Symbol
Length
Meter
m
Mass
Kilogram
kg
Time
Second
s
Temper­ature
Kelvin
k
Electric Current
Ampere
A
Intensity of Light
Candela
cd
Amount of Substance
Mole
mol

Prefixes for Different Powers of 10

Power of 10
Prefix
Symbol
Power of 10
Prefix
Symbol
1018
exa
E
10-1
deci
d
1015
peta
P
10-2
centi
c
1012
tera
T
10-3
milli
m
109
giga
G
10-6
micro
m
106
mega
M
10-9
nano
n
103
kilo
k
10-12
pico
p
102
hecto
h
10-15
femto
f
101
deca
da
10-18
atto
a

Dimens­ional Formula

The relation which expresses physical quantities in terms of approp­riate powers of fundam­ental quanti­ties.

Use of Dimens­ional Analysis

To check the dimens­ional correc­tness of a given physical relation.
To derive relati­onship between different physical quanti­ties.
To convert units of a physical quantity from one system to another.