International System SI Measuring system used in science

International System (SI) • Measuring system used in science – AKA: metric system • Length • Distance between two points – Base unit • meter (m) – Instrument • meter stick or metric ruler Episode 102

• Mass • Amount of matter in a substance – Base Unit • Gram (g) – Instrument • Balance Weight is mass plus the force of gravity. Episode 102

• Volume • Amount of space an object occupies – Base Unit • Liter (L) – Instrument • metric ruler or graduated cylinder Episode 102

• Time • Interval between two occurrences – Base unit • Second (s) – Instrument • Stopwatch • Temperature • Average kinetic energy – Base unit • Celsius (°C) or Kelvin (K) – Instrument • thermometer Episode 102

• Measure the width of your textbook • A measurement includes both a number and a unit • Significant Figures • Measured numbers plus one estimated number Episode 102

Examples of volume measurements 1. Volume of liquid = _______ 2. Volume of solid • Rectangular solid 3 cm 1 cm –V=L x W x H 3 cm – Volume of cube = _______ – Volume of rectangular solid = _______ 5 cm • Irregular solid (rock) – Water displacement Episode 102

Practice problems • What is the volume of the rock? • What is the volume of the rectangular solid? 4 cm 1 cm 2 cm • What would the volume of the rectangular solid be using water displacement? 8 cm 3 = 8 m. L 1 cm 3 = 1 m. L Episode 102