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Metrics
The scientific units of measurement
Why do scientists use metric units?
Easy to use Based on the decimal system (each unit is 10 times
larger than the next) Precise/Accurate measurements smaller than an
inch so you don’t have to use fractions No memorization of conversion facts
e.g. 1 mile= 5,280 feet Globally used so no conversion is needed from one
country to the next
Metric measurement of mass
Mass: measure of the amount of matter in an object….an object’s mass never changes!
Weight: measure of the gravitational pull acting on the object…an object’s weight depends on its mass and location…On Mars a person weighs less than on Earth because the pull of gravity on Mars is weaker than on Earth.
Units of mass: kilogram (kg), gram (g), milligram (mg)
Metric measure of length
Meter (m) is the basic measurement of length.
Metric units of length: kilometer (km), meter (m), centimeter (cm), millimeter (mm)
Metric measurement of volume
Volume: how much space something occupies or takes up.
Metric units of volume: liter (L), milliliter (mL)
Metric measurement of Temperature
Celsius scale is used Basics: Water freezes at 0 degrees C and
boils at 100 degrees C (compared to Fahrenheit scale water freezes at 32 degrees F and boils at 212 degrees F at sea level)
Guidelines to using metrics
7 basic units or stair steps Conversions…”monkey butts” King Henry Doesn’t Usually Drink Chocolate Milk.
The Middle box contains the base units…left and right are prefixes that are attached to the base units (km,kg,kL…mm,mg,mL)
Name
Symbol
Unit
Kilo
k1000
Hecto
h
100
Deka
da
10
Meter,gram, or liter
m,g, L
1
Deci
d
.1
Centi
c
.01
Milli
m
.001