Measurement

The Metric System is a system of measurements and units used all over the world.

United States uses the English System.

A standard is an exact quantity that people agree to use for comparison.

meter (m)

gram (g)

Liter (L)

yard, inch, feet, mile (yd, in, ft, mi)

pounds, ounces (lbs, oz)

fluid ounces, gallon, pint (fl oz, gal, pt)

Must have UNITS !!!!

ALL numbers MUST have units!

Unit examples: m, cm, g, L, ft, yd

In the metric system, we will use the following units:

› Liquid Liters (L)› mass grams (g)› length meters (m)› temperature Celsius ( ºC)› time seconds (s)

Units for other common measurements

Density: g/cm3

Velocity: m/s Acceleration: m/s2

Force: Newton Energy: Joule Power: Watts Volume: cm3

Prefixes are used to determine differences in sizes.

Examples:› kilo = 1000› centi = 1/100th

› milli = 1/1000th

The prefix goes with the base unit.› kilo + meter = km = 1000 meters› centi + meter = cm = 1/100

meters› hecto + meter = hm = 100 meters

kilohecto

centi

unit

milli

deci

Deka

kmhm Dm m

1000 dm 100 cm

10 mm 1 0.10.01

0.001

To convert to a smaller unit, move the decimal point to the right or multiply.

To convert to a larger unit, move the decimal point to the left or divide.

king k kilo henry h

hecto Died D deka unexpectedly u unit drinking d deci chocolate c centi milk m milli

1000 mg = __________ g 160 cm = __________ mm 109 g = ___________ kg 1 L = ____________ mL 14 km = ___________ m 250 m = ____________ km

Volume Volume is the amount of space

occupied by an object. To find the volume of a solid rectangle,

you measure L x W x H To measure volume of liquid, we use

graduated cylinders or other containers marked for measuring.

Density Density is the mass per unit volume of

material. You find density by dividing an object’s

mass by the object’s volume. D=m/v