Systéme International d’unités (SI) International System of Units otherwise known as the metric system....

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Presentation transcript:

Systéme International d’unités (SI) International System of Units otherwise known as the metric system....

General Information International System of Units (SI) is a version of the metric system. SI is based on the powers of 10.

General Information Scientist world-wide have agreed to use SI to allow comparison of data and communication of results with each other.

Length Def: distance between two points Basic Unit: meter (m) Common Units: kilometer (km), meter (m), centimeter (cm), millimeter (mm)

Length Measurement tool: ruler, measuring tape, meter stick Common Conversions: 1 km = 1000 m, 1 m = 100 cm, 1 m = 1000 mm, 1 cm = 10 mm

Meter stick

Mass Def: the amount of matter an object contains. Basic Unit: kilogram (kg) Common Units: kilogram (kg), gram (g), milligram (mg)

Mass Measurement tools: pan balance, triple-beam balance, electronic balance Common conversions: 1 kg = 1000 g, 1 g = 1000 mg

Mass Weight: the pull of gravity on the mass of an object.

Pan balance

Triple-beam balance

Electronic balance

Volume Def: amount of space an object takes up Basic unit: liter (L) Common units: liter (L), milliliter (mL), cubic centimeter (cm 3 )

Volume Measurement tools: graduated cylinder, ruler (for rectangular solids) Common conversions: 1 L = 1000 mL, 1 mL = 1 cm 3

Volume - Reading a graduated cylinder Look at liquid level at eye level. Read at the bottom of the meniscus. Meniscus - the bottom of the curve of liquid in a graduated cylinder.

Looking at graduated cylinder witha meniscus

Volume - How to determine Rectangular solids: volume is determined by measuring height, width, and length and multiplying them together.

Rectangular solid measurements

Volume - How to determine Irregular solids: displacement of liquid (how much the water rises when an object is placed in the water.)

Volume by displacement

Time Basic unit: second (s) Common units: second (s), minute (min), hour (hr) Measurement tools: clock, watch

Common conversions: 1 hr = 60 min, 1 min = 60 s, 1 s = 1000 ms

Temperature Def: a measurement of the average kinetic energy of the molecules in an object. Basic unit: Kelvin (K) Common Units: Kelvin (K), Celsius (°C)

Temperature Measurement tool: thermometer Common conversions: 0 K = -273°C, 0°C = 273 K

Common temperatures: Water freezes - 0°C, Water boils - 100°C, Human body temperature - 37°C, Room temperature - 20°C

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