System Measurements Unit and Conversion Flashcards
“It is a capital mistake to theorize before one has data. Insensibly one begins to twist the facts to suit the theories, instead of the theories to suit the facts.”
Sherlock Holmes
(Arthur Conan Doyle, 1859-1930)
made up of a number and a unit.
measurements
comprises units such as inch, mile, ounce, quarts, etc.
english system or british system
- constitutes units based on powers of 10
- kilometer, centigram, megaliter, etc.
metric system
fundamentals quantity:
length
mass
time
SI or mks:
meter (m)
kilogram (kg)
second (s)
cgs:
centimeter (cm)
gram (g)
second (s)
british:
foot (ft)
slug
second (s)
derived quantity:
area (length)²
volume (length)³
speed (length/time)
SI meaning
system measurements of units
- the official system of measurement used throughout the world.
- built upon a set of seven metric units, which are called base units.
International System of Units
metric units are also called
base units
Physical quantity:
- mass
- length
- time
- amount of substance
- temperature
- electric current
- luminous intensity
- kilogram
- meter
- time
- mole
- kelvin
- ampere
- candela
- kg
- m
- s
- mol
- K
- A
- cd
used to make a new unit larger or smaller than the base unit.
unit prefixes
