Download 1.1 Measurement and Data

Living
Systems/Measurement
Chapter One: Studying Life
• 1.1 Measurements
• 1.2 Thinking Like a Scientist
• 1.3 Graphs
Investigation 1A
Measurement and Data
• Is there a relationship between human
“wingspan” and height?
1.1 Measurement and Data
• A measurement is
a value that tells
the amount of
something.
• A measurement
has a quantity and
a unit.
How do we measure
tiny living things?
1.1 Measurement and Data
• A unit is a fixed amount of something.
• The centipede below is 5 centimeters (5 cm.) in
length.
• The earthworm is 5 inches (5 in.) in length.
• Which is a larger unit, centimeters or inches?
1.1 International System of
Measurement
• Units allow people to communicate amounts.
• To make sure their measurements are accurate,
scientists use a set of standard units that have
been agreed upon around the world.
• The International System of Measurement is
known as the S.I. (System International).
1.1 Length
• Length is a measurement of distance.
• How should we measure the length of this fish?
1.1 Area
• Area is a measurement of how much
surface something has.
1.1 Volume
• Volume is a measurement of the amount
of space something occupies.
1.1 Measuring Liquids
• The surface of a liquid
forms a curve rather than
a straight line.
• That curve is called a
meniscus.
• If the meniscus curves
downward, read the
volume at the bottom of
the curve.
1.1 Mass
• Mass is the measure of the amount of
matter that makes up something.
1.1 Temperature
• Temperature is a
measure of how hot or
cold something is.
• As particles move
faster on average, the
temperature goes up.
• As particles move
slower on average, the
temperature goes
down.
1.1 Measuring Solutions
• A solution is a mixture of two or more
substances that are evenly distributed at the
molecular level.
• Scientists use units of concentration when
measuring levels of dissolved substances in
water.