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Measurement
Biology
‘BIO-’ means lifeEx: biography
-’OLOGY’ means the study of Ex: radiology
What do you think BIOLOGY means?
Metric System
The metric system is also known as the International System of Units (SI)
We will be using the metric system in Science for any measurement
United States is 1 of the 3 countries that does NOT use the Metric System We use inches, pounds, Fahrenheit, etc….
Four Main types of Measurement
1. Volume2. Temperature3. Mass4. Length
1. Volume Definition: Used to measure space in an object
Volume of a Solid Object (LxWxH) Volume of Liquid
Base Unit: Liter (L) kL, L, mL
Measurement Tool: Graduated Cylinder or Beaker
Graduated Cylinder
When you read the volume of a liquid in a graduated cylinder, you must read the MENISCUS Meniscus: curved surface of a liquid in a
tube
2.Temperature
Definition: How hot or cold something is
Unit: Celsius (NOT FAHRENHEIT!!!) -Equipment: Thermometer
3. Mass
Definition: How much mass (stuff) is in an object
Unit: Gram (kg, g)Equipment: Scale
Mass vs. Weight
Mass: the actual measure of the AMOUNT of matterWeight: the measure of the amount of matter effected by gravity
Weight = mass x gravity W=mg
Question: Why is it important to think of matter in terms of mass (and not weight)?
4. Length
Definition: Distance between two points
Base Unit: Meter (km, m, cm, mm)
Equipment: RulerAlways start at 0 cm
WE DO NOT USE INCHES IN SCIENCE!!!
Kilo-liter>Liter (base word)> Centi-liter > Milli-liter
Which is bigger? 50 liters or 50 milliliters?
Abbreviations:Kilo: K Kilogram: KgCenti: C Centigram: cgMilli: M Milligram: mg
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