The International System of Units & Conversions Saturday, November 17, 2018 The International System of Units & Conversions Packet #7 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2014 © Ryan Barrow 2008

Saturday, November 17, 2018 Introduction The data recorded, during the experiment, has to be in a language that is understood by different individuals within the same field. In chemistry, the International System of Units (SI) is used. The International System of Units is a revised version of the metric system 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

11/17/2018 Introduction II In Chemistry, one might come across one these quantities that are measure in SI base units. Mass  Kilogram (kg) Temperature  Kelvin (K) Volume*  Cubic Meter (m3) / Liter (L) * Length  Meter (m) Time  Second (s) Amount of Substance  Mole (mol) Electric Current  Ampere (A) Luminous intensity  Candela (cd) Liter is a non-SI Unit 11/17/2018 © Ryan Barrow 2008 © Ryan Barrow 2008

Common Prefixes & Conversions 11/17/2018 © Ryan Barrow 2008

Introduction There are times that some measurements may be extremely small or extremely large. Due to those measurements, it is often wise to utilize a unit with a particular prefix. 11/17/2018 © Ryan Barrow 2008

Units of Measurements Prefixes Saturday, November 17, 2018 Units of Measurements Prefixes Prefixes that denote multiples of 10 Tera 1012 Giga 109 Mega 106 Kilo 103 Centi 10-2 Milli 10-3 Micro 10-6 Nano 10-9 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Mass 11/17/2018 © Ryan Barrow 2008

Mass The measurement of the amount of matter in an object Saturday, November 17, 2018 Mass The measurement of the amount of matter in an object Mass is measured in kilograms (kg). 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Mass II Common Conversions 1 kilogram = 1000 grams 1 gram = 1000 milligrams 1000 kilograms = 1 metric ton 11/17/2018 © Ryan Barrow 2008

Mass vs. Weight Mass and weight are different Force Saturday, November 17, 2018 Mass vs. Weight Mass and weight are different Force The push or pull required to change the state of motion of an object Measured in Newtons (N) Gravitational Force The force of attraction that every particle of mass in the universe exerts on every other particle Weight is the pull of gravity on a body of mass Weight is the force that gravity exerts on an object. 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Saturday, November 17, 2018 Mass vs. Weight II Mass is always constant regardless of where the mass is located in the universe Weight changes depending on the amount of gravitational force Block #2 & 4 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Calculating Weight F = ma Force (N) = mass (kg) * acceleration (m/s2) Saturday, November 17, 2018 Calculating Weight F = ma Force (N) = mass (kg) * acceleration (m/s2) Weight is a measurement of force W = mg g = acceleration due to gravity 9.8 m/s2 ((10 m/s2)) 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Temperature 11/17/2018 © Ryan Barrow 2008

Saturday, November 17, 2018 Temperature The degree of hotness or coldness of a body of mass or environment. There are three scales of measurement Celsius The scale of choice Fahrenheit Kelvin 0 degrees = Absolute zero (lowest possible temperature that can be attained by cooling an object. In chemistry, Kelvin is the SI unit. 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Conversions Among Temperature Scales Saturday, November 17, 2018 Conversions Among Temperature Scales Scales Celsius T (Celsius) = (5/9)*(T (Fahrenheit) -32) Fahrenheit T (Fahrenheit) = ((9/5) * (T (Celsius)) + 32 Kelvin (Absolute) 0 degrees = Absolute zero (lowest possible temperature that can be attained by cooling an object = T (Celsius) + 273.15 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Volume 11/17/2018 © Ryan Barrow 2008

Volume The amount of space that a 3D object takes up Saturday, November 17, 2018 Volume The amount of space that a 3D object takes up Volume is measured in liters /cubic meters 1 Liter = 1000 milliliters (mL) 1 Liter = 1000 cubic centimeters (cm³) 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Volume Common Conversions within volume Saturday, November 17, 2018 Volume Common Conversions within volume 1 Liter = 1000 milliliters (mL) 1 Liter = 1000 cubic centimeters (cm³) 1 Liter = 1 cubic meter (m3) 1 ml = 1 cm3 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Length 11/17/2018 © Ryan Barrow 2008

Saturday, November 17, 2018 Length A linear measurement of an object, end-to-end; it is usually the longest dimension. Length is measured in meters. 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Length Common Conversions 1 meter = 100 cm 1 centimeter = 10 mm Saturday, November 17, 2018 Length Common Conversions 1 meter = 100 cm 1 centimeter = 10 mm 11/17/2018 10:47:20 AM11/17/2018 10:47:20 AM © Ryan Barrow 2008 © Ryan Barrow 2008

Review 11/17/2018 © Ryan Barrow 2008