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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
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.
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
Making Measurements in Science
The Metric System The scientific system of measurement
Types of quantitative observations
How do we measure things in science?
When we measure you need to know: › What you are measuring (the object) › What you are measuring with (which tool) › What you are measuring in (the.
The Metric System.
The Metric System. 1.The Metric System a. Standard system used by scientists. b. AKA S.I. (International System of Units) c. Decimal System based on the.
What tools do scientists use to measure length or distance?
Metric System Measurement.
MATTER– Anything that has MASS and VOLUME.
Measuring in “The Metric Zone”
Science Notes ~ Metrics.
Measurement and Math SI Units Tools and Methods. Accuracy and Precision.
Length – the distance between 2 points Circumference – distance around a circular object.
Length- the basic unit of length is the meter. Meter- SI unit of length - It is the distance between the doorknob and the floor.
Metric Review. International System of Units (SI) Base of 10 1 meter = 100 centimeters=1000 millimeters Standard Units: -Mass = gram (g) -Length = meter.
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