Chapter 2.pptx

# Chapter 2.pptx - Numbers Numbers Everywhere But Not A...

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CHAPTER 2 MEASUREMENT AND PROBLEM SOLVING Numbers, Numbers Everywhere, But Not A Decimal To Think.
MEASURED VALUES
MEASURED VALUES A numerical value. A unit of measurement. The name of what is being measured.
EXAMPLE The sample is 256 grams of lead.
EXAMPLE The sample is 256 grams of lead. Numerical Value = 256 Unit of measurement = grams Identity = lead
INTERNATIONAL SYSTEM OF UNITS (SI)
INTERNATIONAL SYSTEM OF UNITS (SI) The metric system with a few added bells and whistles. Yes, you can blame the French.
INTERNATIONAL SYSTEM OF UNITS (SI) Consists of a set of base units , a set of derived units with specific names, and a set of decimal-based multipliers that are used as prefixes .
BASE UNITS These are the building blocks of SI. All of the other units of measure can be derived from these base units.
BASE UNIT MASS Kilogram Unit symbol = kg.
BASE UNIT LENGTH Meter Unit symbol = m.
BASE UNIT TIME Second Unit symbol = s.
PREFIX MULTIPLIERS Prefixes are added to unit names to change the value of the unit by powers of 10.
PREFIX MULTIPLIERS All of the multipliers are integer powers of ten, and above a hundred and below a hundredth all are integer powers of a thousand. The prefixes never combine, and multiples of the kilogram are named as if the gram were the base unit. So a millionth of a kilogram is a milligram, not a microgram.
DERIVED UNITS A derived unit is formed from other units. They are formed by powers, products or quotients of the base units and are unlimited in number.
DERIVED UNITS In chemistry, many units of volume , a measure of space, are derived units. Any unit of length when raised to the third power (cubed) becomes a unit of volume.
VOLUME Believe it or not, the liter is actually not an SI unit. The SI unit of volume is the cubic meter.
VOLUME Liters are usually used for items measured by the capacity of their container and cubic meters are usually used for items measured either by their dimensions or their displacements.
VOLUME Let’s just pretend that the liter is a base unit, okay.
CONVERTING BETWEEN UNITS Rules for converting units.

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• Spring '16
• RexJ.Gamble
• International System of Units

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