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Notes – Measurement (7 th grade)

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International System of Units a way of measuring based on multiples of ten (10, 100, 1000…) abbreviated S.I. also called the metric system most of the world uses it

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Length the distance between two points the basic unit: meter tool used: ruler or meterstick NO! YES!

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Length

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Know what each line represents! 2.0 2.1 2.22.42.62.83.0 2.32.52.72.9

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Length 1. Length = ______ _____

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Length 2. Length = ______ _____

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Length 3. Length = ______ _____

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Length 4. Length = ______ _____

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Length 1. Length = ______ _____ 1.9 cm

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Length 2. Length = ______ _____ 4.3 cm

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Length 3. Length = ______ _____ 16 cm

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Length 4. Length = ______ _____5.8 cm

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Volume the amount of space an object takes up the basic unit: depends if it’s solid or liquid tool used: depends if it’s solid or liquid

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Liquid Volume the basic unit: liter tool used: graduated cylinder

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Liquid Volume liquids curve inside a narrow container a meniscus is the convex or concave surface of a column of liquid How do you measure? or

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Liquid Volume 1.Figure out the scale being used by interpreting what each unlabeled line is. 6.0 8.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 7.0 ? NOPE!

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Liquid Volume 1.Figure out the scale being used by interpreting what each unlabeled line is. 6.0 8.0 6.2 6.4 6.6 6.8 7.0 7.2 7.4 7.6 7.8 YEP!

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Liquid Volume 2. Line your eye up with the water line.

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Liquid Volume 3. Pick the line closest to the bottom of the curve.

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Liquid Volume Which line? or Volume = ___________ 6.6 mL

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Solid Volume the basic unit: cubic meter tool used: ruler or meterstick

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Solid Volume area = length x width the unit is squared 6 square meters 6 m 2 meters

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Solid Volume volume = length x width x height the unit is cubed What is the volume? 4 cm x 3 cm x 2 cm 24 cm 3

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Mass the amount of matter in an object the basic unit: gram tool used: triple beam balance or electronic balance

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Triple-Beam Balance Use: 1.Move sliders until it balances. 2.Add together the numbers on all 3 sliders. Mass

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100 g 60 g + 7.5 g 167.5 g What is the mass?

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To find the mass of ONLY the sand: 1.Find the mass of the empty cup. 2.Find the mass of the sand and the cup. 3.Subtract. Mass

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167.5 g - 45 g 122.5 g If the mass of the cup is 45 g, what is the mass of only the sand?

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Mass to find the mass of ONLY the sand: 1.Place the EMPTY beaker on the balance. 2.Press the “tare” or “zero” button to get the mass to zero. 3.Fill the container with what you want to weigh, and record the mass.

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Temperature the measure of the average energy of the motion of particles in a substance the basic unit: º Celsius tool used: thermometer water freezes at 0ºC and boils at 100ºC. put a minus sign (-) if it’s below zero

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Temperature SCALE each line is __ degree(s) SCALE each line is __ degree(s) SCALE each line is __ degree(s) 1 12

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Summarize UnitLab Tool Length Liquid Volume Solid Volume Mass Temperature meter (m) ruler or meterstick liter (L) graduated cylinder cubic meter (m 3 )ruler gram (g) triple beam balance or electronic balance °Celsius (°C)thermometer

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The Metric System How do we measure things in science?

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