1-3: Measurement What do scientists use to measure length, mass, volume, density, time, and temperature?

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Presentation transcript:

1-3: Measurement What do scientists use to measure length, mass, volume, density, time, and temperature?

Anticipatory Set What units of measure have you used in science investigations in the past?

Science Standard 8.8.a: Students know density is mass per unit volume. California Standards Science Standard 8.8.a: Students know density is mass per unit volume. Science Standard 8.8.b: Students know how to calculate the density of substances from measurements of mass and volume.

Input SI: International System of Units (French, Systeme international d’Unites). weight: measure of the force of gravity on you. mass: measure of the amount of matter an object contains. volume: the amount of space an object takes up.

Input meniscus: curved, top surface of the water in a graduated cylinder. density: mass per unit volume Celsius scale: water freezes at 0 degrees and boils at 100 degrees. Kelvin Scale: SI unit of temperature. absolute zero: 0 K (nothing can get colder)

Modeling Using SI as the standard system of measurement allows scientists to compare data and communicate with each other about their results. SI is based on the number 10.

Modeling SI unit of length is the meter. SI unit of mass is the kilogram. SI unit of volume is the cubic meter (m3). SI unit of density is the kilogram per cubic meter (kg/m3). SI unit of time is the second (s). SI unit of temperature is the kelvin (K).

Volume = Length x Width x Height Modeling Volume = Length x Width x Height

Density = Mass ÷ Volume Modeling An object that has a density less than 1.00 g/cm3 will float in water.

Modeling D = M ÷ V D = 50 g ÷ (2cm x 2cm x 2cm) D = 50 g ÷ 8 cm3 Two solid cubes have the same mass. They each have a mass of 50 g. Cube A has a volume of 2cm x 2cm x 2cm. What is its density? D = M ÷ V D = 50 g ÷ (2cm x 2cm x 2cm) D = 50 g ÷ 8 cm3 D = 6.25 g/cm3

Modeling D = M ÷ V D = 50 g ÷ (4cm x 4cm x 4cm) D = 50 g ÷ 64 cm3 Two solid cubes have the same mass. They each have a mass of 50 g. Cube B has a volume of 4cm x 4cm x 4cm. What is its density? D = M ÷ V D = 50 g ÷ (4cm x 4cm x 4cm) D = 50 g ÷ 64 cm3 D = 0.781 g/cm3

Check for Understanding SI units are based on multiples of what number? 10 Will an object with a density of 0.7 g/cm3 float or sink in water? float, less than 1

Guided Practice Independent Practice Answer #5, 8, 13 Finish the 1.3 Review & Reinforce worksheet.

HOMEWORK EXTENSION Write a detailed SUMMARY of the section and complete the UNANSWERED QUESTIONS section of your notes. Choose two of the remaining Depth & Complexity ICONS in your notes and explain how they relate to this section.