**The Metric System Guide**

Studying for the Unit Test? Click below for Resources supplemented from the classroom text:

http://www.phschool.com/webcodes10/index.cfm?wcprefix=cgd&wcsuffix=6021&fuseaction=home.gotoWebCode&x=10&y=8

Students spent the 1st semester learning all about the Metric System. This is a prerequisite for Middle School Science. Here is an outline of what we learned:

**Metric System:**a system of measurement based on the number 10.

Modern scientists use a version of the metric system called the International System of Units, abbreviated as

**SI**.

**Common SI Prefixes:**

Kilo- means 1,000

Centi- means .01 (one hundredth)

Milli- means .001 (one thousandth)

## I. Length

MM & CM is the way to go!

**Definition:**

**The DISTANCE from one point to another**

Basic Unit of Length in the SI System is the

**Meter (m)**

Common tool used to measure length is the

**Metric Ruler.**

## II. Mass

Balance Scale Practice!

**Definition:**

**A measure of the amount of matter an object CONTAINS.**

Basic Unit of Mass in the SI System is the

**Kilogram (kg)**. Smaller objects will use the

**G**

**ram (g).**

Common tool used to measure mass is the

**balance scale**or triple-beam balance.

## III. Volume

Students demonstrate proper use of the GC

**Definition:**

**The amount of SPACE an object takes up.**

Volume of Liquids:

Scientists commonly use a unit known as the

**liter (L)**to measure the volume of a liquid.

Scientists commonly use a

**graduated cylinder**to measure liquid volume. The graduated cylinder is marked off in 1-millimeter segments. The surface of the water in the graduated cylinder is curved. The curve is called the

**meniscus**. To determine the volume of water, you should read the milliliter marking at the bottom of the curve.

Volume of Rectangular Solids: To find the volume of a rectangular object, like a video tape, you want to use the cubic centimeter (cm3). For larger volumes, scientists use the SI unit known as the cubic meter (m3). Calculate volume by conducting this formula:

Volume of Irregular Solids:

If you want to find the volume of an irregular shape object, like a rock, you can immerse the object in water, and measure how much the water level rises.

In lab, we found the volume of irregular objects like a paper clip, a die, a game piece...Great job, class!

**V = Length x Width x Height.**Volume of Irregular Solids:

If you want to find the volume of an irregular shape object, like a rock, you can immerse the object in water, and measure how much the water level rises.

In lab, we found the volume of irregular objects like a paper clip, a die, a game piece...Great job, class!

## IV. Density

Students looked at the density of various liquids

**Definition:**

**A measure of HOW MUCH MASS is contained IN a given VOLUME.**

To find the density of an object:

**Density = Mass / Volume**

Two common units of density are:

**g/cm3 and g/mL.**Because we use grams most of the time in Science to measure mass, look to see what you use to measure your volume.

## V. Time & Temperature

Time: Basic unit in the SI system to measure time is the

Temperature: Basic unit in the SI system to measure temperature is the

**second (s)**.Temperature: Basic unit in the SI system to measure temperature is the

**kelvin (k)**. Scientists commonly will use the**celsius (C)**.**Absolute Zero**is what scientists consider the coldest possible temperature, which is equal to 0 K or -273 C.Reference: Kemp, Andrew.

*The Nature of Science and Technology*. Boston: Pearson, 2009. 44-55. Print.