Science Notes ~ Metrics.

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Presentation transcript:

Science Notes ~ Metrics

International System of Units (SI): standard system of measurements based on multiples of ten

Why do we use a system of measurements? In science we need to have accurate and precise communication A measurement of “1” means nothing UNLESS it has units.

A Measurement Has Three Parts The numerical value which tells how much The unit, which tells us what the measurements are in The type of measurement 25 cm VALUE MEASURING LENGTH UNIT

1. Liquid Volume: the amount of space a liquid takes up Unit of measurement is liter (L) - Scientific tool use to measure liquid volume is a graduated cylinder - Example: 1 L = the volume of a medium water bottle

Read at the meniscus, lowest point of the liquid

Finding the Volume of a Solid… A. Regular Shaped Objects (cube) Volume = L X W x H Volume = cm x cm x cm Volume = cm3 H E I G LENGTH T WIDTH

Example: Volume = L x W x H. Volume =3. 80 cm x 2. 60 cm x 3. 80 cm Example: Volume = L x W x H Volume =3.80 cm x 2.60 cm x 3.80 cm Volume = 37.54 cm3

B. Volume - Irregular Shaped Object… Fill a graduated cylinder to a certain level with water. Next, put the object in see how much the water rises up. Then subtract the original level from the second water level to find the volume. 1 mL = 1 cm3

2. Length: the distance between two points Standard (base) unit of measure is meter (m) Large distances measured in kilometers (km)

Smaller distances are measured in centimeters (cm) or millimeters (mm) Use metric ruler or meter stick to measure length Example: 1m = distance from the floor to the doorknob

3. Mass: the amount of matter in an object Matter is “anything that takes up space” Unit of measurement is gram (g) Large measurements are measured in kilograms (kg)

Scientific tool used to measure mass is a balance 1000 grams = 1 kg Scientific tool used to measure mass is a balance

MASS VS WEIGHT is the same wherever you are Is defined as the force of gravity on the object Measured with spring scale Changes from planet to planet

PAN BEAMS Zero RIDERS POINTER Adjustment Knob

4. Temperature A measure of the average energy of motion of the particles of a substance The more the particles move the higher the temperature The less the particles move the colder the temperature Unit of measurement is degrees Celsius ºC Water freezes at 0ºC and boils at 100 ºC