5 The International System The International System of Units, or SI for short, was designed to provide a worldwide standard of physical measurement for science, industry, and commerce.
6 SI prefixes: Prefix Multiplier giga- 1,000,000,000 mega- 1,000,000 kilo-1,000hecto-100deka-10[unit]1deci-0.1centi-0.01milli-0.001micro-nano
7 Length Length is defined as the distance between two points. The meter is the SI unit of measure for lengthOne meter is about the size of a baseball batThe size of rooms or buildings is often measured with a meter, smaller objects such as a book or pencil is measured with either centimeter or millimeter.Long distances may be measured with kilometersHow many kilometers is a marathon?
8 Volume Volume is the amount of space an object occupies. Volume describes the amount of space inside a 3D object, therefore the unit is cubedThe cubic meter m3 is the SI unit for volumeTo measure the volume of a square or rectangle, measure the length, width, and height and multiply them together.A liter is a measurement of liquid volume (a 2-liter of soda)1L=1000 cm3
9 MassThe mass of an object measures the amount of matter in the object.This is different from weight***Kilogram is the SI unit for massYou can determine mass with a triple beam balance.
10 Weight Weight is a measurement of force. The SI unit for weight is newton (N)What force determines our weight?? Hint- if you travel to other planets you would weight different amounts depending on the amount of this force present.
11 TemperatureThe physical property of temperature is related to how hot or cold an object is. Temperature is a measure of the kinetic energy, or energy of motion, of the particles that make up matter.Temperature is measures in SI Units with the kelvin (K) scaleFarenhiet and Celsius temperature scales are the most commonly used scales. These scales DO NOT start at zero (hence both having negative numbers) Kelvin starts at ABSOLUTE ZERO
13 Time and Rates Time is the interval between two events The SI unit for time is seconds (s), time is also measured in hours (h)A rate is the amount of change of one measurement in a given amount of timeSpeed is a common type of rate measured (kilometers per hour km/h)
14 DISCLAIMERSeveral units we use everyday are NOT used throughout the rest of the world, and are NEVER used in science.For example: miles, pounds, inches