I MEASUREMENTS A ALL MEASUREMENTS MUST HAVE TWO

I. MEASUREMENTS A. ALL MEASUREMENTS MUST HAVE TWO PARTS 1. A NUMBER – TELLS HOW MUCH IS BEING MEASURED 2. A UNIT – TELLS WHAT IS BEING MEASURED EX: 1 gram mass 50 seconds time

A. Base Units – a unit based on an object or event in the physical world. B. Derived units – unit defined from a combination of several base units ex: Density = mass / volume units: g / L

Lengththe measure between two points Unit = meter (m) Instrument = ruler, meter stick, measuring tape A B C D longer distance shorter distance

Time- the measure of the interval between two events Unit = seconds (sec) Instrument- watch, stopwatch

Mass- the measure of the amount of material in an object Unit = gram (g) Instrument- balance less mass more mass less mass

Volume- the amount of space an object occupies Unit = Liter (L) or cubic centimeters (cm³) or (cc) Instrument- graduated cylinder or ruler Formula: V = l x w x h (cube, rectangular prism)

Density- the measure of the amount of mass in a given volume Unit = grams liter D = mass volume or grams cm³ (g/L or g/cm³) Instrument- balance and graduated cylinder

Temperature- the amount of energy in the particles of a substance Unit = degrees Celsius (°C) , Fahrenheit (°F), Kelvin (K) Instrument- thermometer K = 273 -°C °F = °C(1. 8)+32 °C = 273+K °C = °F-32 (1. 8)

Area- the measure of the surface of an object Unit = centimeters squared (cm²) Instrument- ruler A = l x w (square, rectangle) A = pr 2 (circle) outside of balloon outside shell of egg