Unit 1: Nature of Science. Measurement....system of measurement. Unit 1: Nature of Science....
Transcript of Unit 1: Nature of Science. Measurement....system of measurement. Unit 1: Nature of Science....
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Today most scientists, in almost all countries use the International System of Units (SI units) as their system of measurement.
Unit 1: Nature of Science. Measurement.
Reason 1: helps scientists share and compare their data/ results
Reason 2: Another advantage of SI units is all units are based on the number 10; meaning they are
easily converted from one unit to another
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Unit 1: Nature of Science. Measurement.
Length: the distance from one point to another
Basic SI Unit of length: meter Base unit symbol: m
Tool used to measure length: meter stick
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Volume: The amount of space that matter occupies.
VOLUME OF A LIQUID
Basic SI Unit of liquid volume: liter
Base unit symbol: L
Tool used to measure liquid volume: graduated cylinder
Unit 1: Nature of Science. Measurement.
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Volume of REGULARLY SHAPED SOLID OBJECTS
Basic SI Unit of solid volume: cubic centimeter Base unit symbol: cm3
Tool used to measure solid volume: meter stick To calculate solid volume: L x W x H
Unit 1: Nature of Science. Measurement.
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Unit 1: Nature of Science. Measurement.
Mass: is the amount of matter that something is made of
Basic SI Unit of mass: gram
Base unit symbol: g
Tool used to measure mass: triple beam balance
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Volume of an Irregularly Shaped Object
Basic SI Unit: cubic centimeter
Base unit symbol: cm3
Tool used to measure volume of irreg. solid: graduated cylinder
Unit 1: Nature of Science. Measurement.
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Water Displacement method:
Volume of liquid after object has been submerged - Original Volume of liquid in grad. Cylinder
Answer is volume of irregular solid object (cm3)
Unit 1: Nature of Science. Measurement.
Dora Example 48 mL -44 mL 4cm3
***BECAUSE 1mL = 1cm3
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Unit 1: Nature of Science. Measurement.
Weight: is a measure of the force of gravity on an object
Basic SI Unit of weight: Newton Base unit symbol: N
Tool used to measure weight: spring scale
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Mass DOES NOT change with location, weight DOES!
Unit 1: Nature of Science. Measurement.
Mass vs. Weight
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Temperature: is a measure of how hot (or cold) something is. Specifically, the measure of average kinetic energy of the particles in
the object.
Unit 1: Nature of Science. Measurement.
Basic SI Unit of temperature: Degrees Celsius
Base unit symbol: °C
Tool used to measure temperature: thermometer
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Time: the measure of a passing interval, from one event to another
Unit 1: Nature of Science. Measurement.
Basic SI Unit of time: second
Base unit symbol: s
Tool used to measure
time: stopwatch
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Density the amount of “stuff” in a particular space - The density of room temp. water is 1 gram/ cm3
- An object will SINK in water if an objects density is greater than 1 g/cm3.
- An object will FLOAT in water if its density is less than 1 g/cm3 it will.
- Density = mass volume
Unit 1: Nature of Science. Measurement.
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An objects density does NOT change when it is broken in half! The molecules are still packed in the same way, no matter the size of the sample. D= m/v
D= 60 g/25cm3
D= 2.4 g/ cm3
D= m/v D= 120 g/ 50cm3 D= 2.4 g/ cm3
D= m/v D= 96 g/ 40cm3 D= 2.4 g/ cm3
Unit 1: Nature of Science. Measurement.