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The Metric System

Background Information
Used all over the world (except USA) Common language of scientists Based on 10s S.I. Units: International System—standard units agreed upon by everyone.

Linear Measurement Definition:
Measuring in line (distance, length, width, etc.) S.I. Unit: Meter (m) Common Units: Centimeter (cm) cm = 1 m Millimeter (mm) mm = 1 m Kilometer (km) 1000m = 1 km Tools: Meter stick, ruler

Measurements are always read to the certain markings AND then estimated one place beyond that marking. This line reads as 3.5 cm cm This line reads as 2.85 cm cm

Volume Measurement Definition: The amount of space an object takes up
S.I. Unit: NO S.I. unit Common Units: Liter (L or l) Milliliter (mL or ml) mL = 1 L Cubic centimeter (cm3) 1 cm3 = 1 mL Tools: Graduated cylinder or ruler

Other facts/notes Meniscus
Meniscus: the curve that forms on the surface of a liquid. Meniscus Read volume at the BOTTOM of the curve

Temperature Measurement
Definition: The measure of the motion of particles in a substance. The more motion, the higher the temp. S.I. Unit: Kelvin (K) 0 K = absolute zero 0 K = -273 oC Common Units: Degrees Celcius (oC) Tools: Thermometer

Other facts/notes Water freezes at 0 oC Water boils at 100 oC
Normal room temp is 20 oC Normal human body temp is 36 oC

Mass Measurement Definition:
Mass is the amount of stuff (matter) in an object S.I. Unit: Kilogram (kg) Common Units: Gram (g) g = 1 kg Milligram (mg) mg = 1 g Tools: Triple beam balance

Other facts/notes 1 ml of water has a mass of exactly 1 gram
When using a triple beam balance: Always “zero” the balance first Move the largest (100 g) mass first, Then move the 10 g mass, Then slide the smallest mass until it balances. Read balance to nearest .01g

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