B. Volume – amount of space a substance occupies 1. Solid (such as a brick) – would use V = l x w x h units are often expressed as cubic meters (m3) or cubic centimeters (cm3 = cc ) Volume of irregular shaped objects can be measured by water displacement
2. Liquid - measure capacity in a container. Most common units are ml and liters. An important conversion is: 1 mL = 1 cm3 = 1 cc
Ways to measure liquids: Graduated Cylinder accurate device
C. Mass (kg)– measure of the amount of matter in an object Ex: golf ball vs. ping pong ball Each have about the same volume but mass is different. Golf ball has about 18x more mass
Measuring mass: 1. Triple balance beam 2. Digital scales
Mass vs. Weight Mass is amount of matter in an object. Weight is the measure of gravity’s effect on something (force) units are Newtons (N) for metric and pound (lbs) for English system. Ex: move to a different planet and weight changes but mass stays the same weightlessness not masslessness (not even a word !!)
D. Temperature – measure of the amount of molecular movement Important Temperatures to Memorize
Measuring temperature: 1. Mercury thermometers 2. Digital Thermometers
E. Time (seconds)– duration; Measuring devices: 1. stopwatch 2. digital timers
F. Mole – the amount of a substance (mol) Not this!!
F. Mole – the amount of a substance (mol) mole = 6.022 x 1023 particles of a substance Ex: a mole of popcorn = 6.022 x 1023 of kernels of popcorn Enough popcorn to cover the entire US at a height of 310 ft!
The mole is showing the value of a mole Happy mole day….October 23rd!