Chapter 2 Data Analysis Section 2.1 Units of Measurement.

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Presentation transcript:

Chapter 2 Data Analysis Section 2.1 Units of Measurement

Metric System Units for scientific measurements Developed in France in 18 th century Unlike English system

SI Units International agreement Updated metric system 7 Base Units

Base Units Measurements based on an object or event in the physical world Independent of other units

Prefixes Decimal fractions Multiples of various units Ex: milli-

Prefixes

Length and Mass Length SI Unit  meter (m) 1 meter = yd Mass SI Unit  kilogram (kg) 1 kg = 2.2 lbs Unusual use of prefix

Temperature Hotness/coldness Direction of heat flow Celsius and Kelvin

Celsius Scale Everyday scale in most countries Used often in scientific studies 0  C= Freezing point of water 100  C= Boiling point of water at sea level

Fahrenheit to Celsius  F = (9/5) (  C) + 32  C = (5/9) (  F + 32)

Kelvin Scale SI temperature scale Based on the properties of gases Zero is the lowest obtainable temperature Absolute Zero 0 K =  C

Kelvin to Celsius K =  C

Derived Units Unit derived from a combination of base units Examples: Volume and Density

Volume Derived SI Unit Cubic meters (m 3 ) Cubic centimeters (cm 3 ) used in chemistry cc 1 milliliter = 1 cubic centimeter »1 mL = 1 cm 3

Density Density = Mass/Volume Derived SI Unit –g/cm 3 –g/mL Always specify temperature when reporting density!! If no specification, assume 25  C

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