Transcript Document

Measurement
What is Measurement?
• Measurement is a way to
describe the world with
numbers.
What is Estimation?
• Estimation can help you make a
rough measurement of a object
by guessing.
Estimation
• Estimation is based on
experience and improves with
experience, practice and
understanding.
Estimation
• Using estimation is like making
a comparison
• Estimate using “about”
Precision and Accuracy
• Precision describes how
carefully you make your
measurement.
• Accuracy compares a
measurement to the real value.
Rounding a Measure
• Rounding is a method of showing the
most relevant numbers of a
measurement.
Precision and Number
of digits
• More digits included after a
decimal makes a more precise
measurement.
GPS Systems
GPS = Global Positioning System
This is a way of determining an exact
position on the earth.
GPS is based on reference lines on a map
of the Earth.
Latitude is a series of parallel, horizontal
reference lines.
Longitude is a series of vertical lines
that all pass through the poles of the
Earth.
SI Units
• SI Units = International System
for measurement
SI Units
Insert chart
Prefixes Used with SI
Units
• Insert chART
Length
• Length is a measure of the longest
part of a object.
Volume
• Volume is a measure of the amount
of space an object occupies, or
takes up.
Mass
• Mass is a measure of the
amount of molecules making up
a substance.
Weight
• Weight is a
measure of the
force of gravity
acting on an
object.
Temperature
• Temperature is a
measure of the
average motion of
the molecules in a
substance.
• Temperature
scales are in
oC, oF, oK
Time and Rates
Rate is a
ratio of two
measureme
nts with
different
units