living systems
DESCRIPTION
Living Systems. 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. - PowerPoint PPT PresentationTRANSCRIPT
Investigation 1A
• Is there a relationship between human “wingspan” and height?
Measurement and Data
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 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 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.