Unit+One

Voc **abulary Terms:**
__Mass__ is "the amount of matter that something is made of"(Holt Science and Technology; Physical Science, 756). The metric system unit that measures mass is grams. Kilograms and milligrams are also used to measure mass.

__Volume__ is "the amount of space that something occupies or the amount of space it contains"(Holt Science and Technology; Physical Science, 760). The metric system unit used to measure the volume of a liquid is liters. The volume of solids is measured in cubic meters in the metric system. Smaller solids may be measured in cubic centimeters or cubic millimeters, whereas very large objects might deal with units such as cubic kilometers. A meniscus is "the curve at a liquids surface by which you measure the volume of the liquid"(Holt Science and Technology; Physical Science, 756). The lowest point of the meniscus is where the measurement should be taken from. to get the exact meniscus, is to look at the cylinder at exact eye level. ex: Density is "the amount of matter in a given space; mass per unit volume" (Holt Science and Technology; Physical Science, 752). Density is found through the equation D=m/v.(ex: D=3.2/9.4), Something with a mass of 75 grams and a volume of 20 centimeters cubed (the same as the example on page 27 of Holt Science and Technology; Physical Science) has a density of 3.75 grams per centimeter cubed. A liquid might have a density of several grams per milliliter, (abbreviated g/ml).

Unit Objectives:
1) Recognize that all matter has density because all matter has mass and volume 2) Density can be calculated and is unique for each substance 3) Density does not change

**Calculating Density**
Density is a mathematical ratio represented by: units are expressed as g/mL or g/cm3 Always write ALL 3 steps when writing density equations.
 * density= mass/ volume**