Topic: Measurements and Density

Time Rate at which something happens Instruments: Stop watch, clock Units: seconds, minutes, hour, days

Length Distance between two points Instruments: Ruler, Meter Stick Units: feet, miles, meter, kilometer 5,280 feet = 1 mile = 1.6 kilometer

Metric System Kilometer Decameter Meter Decimeter Centimeter Millimeter Hectometer Based on a Factor of 10

Reading a metric ruler correctly: This point can be read as 6.70 cm. or 67.0 mm.

More Practice! ---

Temperature Average kinetic energy in a sample Instruments: thermometer Units: °F, °C, ˚K ESRT pg 13

Mass Amount of matter in an object Instruments: Electronic Scale Units: grams

Mass vs. Weight Mass - amount of molecules in an object. Weight - effect of gravity on mass

Think of Astronauts The Moon’s gravity is 1/6 th of the Earth’s If you weight 130 pounds on Earth, on the Moon you would weigh 21.7 lbs. Space suit worn by astronauts weighed 180 pounds on Earth and 30 pounds on the Moon with the reduced lunar gravity.

Volume Amount of space something takes up Instruments: graduated cylinder, ruler Units: ml, cm 3 V = LxWxH

Measuring Volume Width Height Length

Measuring Volume

Just Right

Practice -

Water Displacement Method Meniscus How do you measure volume for an irregular object?

Measuring Volume Always read the meniscus How do we measure volume of a irregular object? Volume with object Original Volume

When Stating a Measurement Remember the… cm 0 C cm 3 ml sec.g

FQ What is the volume of this rock?

Topic: Density changes with Temperature & Pressure

Density - ESRT pg 1 - Density = mass/volume Units = g/cm 3 or g/ml

Density Triangle

Phases Of Matter

Phases of Matter In most cases Solids are - Liquids are - Gases are - The exception is water because -

When volume is constant (same)… Mass decreases, - Mass increases, -

Question If a uniform substance has a mass of 18 g, volume 6 cm 3. If cut exactly in half, what happens to the density? *__

As temperature increases, -

When mass is constant (same)… Volume decreases (compacts), atoms are closer together - Volume increases (expands), atoms are farther apart, -

Heater Warm air Lower Density Air Rises Air cools Density Increases Air sinks Convection – -

Pressure Pressure -

Pressure increases, volume decreases, -

Pressure decreases, volume increases -

Lets test it !!!!