Metric system/Si/ English system of measurement

• The International System of Units (SI)

  • More modern form of the metric system

  • This determines the base units for measurement

• The English System

  • Based off of human features

  • Flawed

  • Only three countries besides the U.S. uses this

  Units of Measurements	Metric system (SI)	English system
  Mass	Gram	none
  Length	Meter	none
  Liquid	Liter	none
  Weight	Neutron	Pound
  Temperature	Celsius	Fahrenheit
  Time	Second	Second

Weight v.s Mass

• Weight

  • The pull of gravity on an object

  • The weight of an object changes depending on where it is located

    • So not so great of a measurement

• Mass

  • The measurement of the number of atoms in an object

  • The mass of an object stays consistent no matter the location

    • A great measurement

Volume and Density

• Volume

  • The amount of space an object takes up

  • Formula (Solids): Base*Width*Height

• Key Idea

  • Mass and volume are different

    • Large objects may have a small mass and vice versa

  Always read Beakers at the lowest point of the liquid

  • 1 cm₃ is equal to 1 mL

• Density

  • The measurement of the amount of matter in a defined amount of space

  • Units:

    • Solid g/cm₃

    • Liquid: g/mL

  • Density Formula is Mass/Volume

    • The density of water is 1 g/mL

      • If object is denser it will sink

      • If object is lighter it will float