Chapter 1 Lesson 3 Measure- A Common Language Review

International System of Units

(SI) A system of measurement based on multiples of ten and on established measures of mass, length and time.

Centi-

(c) Centimeter 0.01 (one hundredth)

Deci-

(d) decimeter and 0.1 (one tenth)

Deka-

(da) dekameter and 10

Hecto-

(h) hectometer and 100

Kilo-

(k) Kilometer and 1,000

Meter

(m) Basic unit of measurement and 1

Milli-

(m) Millimeter 0.001 (one thousandth)

Temperature

The basic SI unit is Kelvin, a thermometer is used to measure it and when it is 0°C, it's 273 K and when it is 100°C, it's 373 K.

Time

The basic SI unit is second and clocks and watches are used to measure it.

Meniscus

The curved upper surface of a liquid in a column of liquid.

Weight

A measure of gravity action on an object and a scale is used to measure it.

Density

A measure of how much mass is contained in a given volume, the basic SI unit is kilograms per cubic meter and for smaller objects, grams per cubic centimeter.

Metric System

A system of measurement based on the number 10.

Density of Substances

The density of a pure substance is the same for all samples of that substance and when you know an object's density, you can find out if it will float in a given liquid.

Measuring Length

For measuring smaller than a meter, you use centimeter and millimeter and for measuring a long distance, you use kilometer.

Calculating Density

The density of an object is the object's mass divided by its volume. D = mass/volume (formula)

Length

The distance from one point to another, the basic SI unit is meter and a metric ruler is used to measure it.

Mass

The measure of matter in an object, the basic SI unit is kilogram and for smaller masses, grams or milligrams and a balance is used to measure it.

Volume of Liquids

You use liter to measure it, millimeters for smaller volumes, and you read the bottom of the meniscus to find the volume.

Units of Density

Because it is made up of mass and volume, an object's density is expressed as a relationship between two units.

Two Temperature Scales

Celsius and Kelvin

Why Scientists Use SI

It allows them to compare data and communicate with each other about their results.

Common SI Prefixes

Kilo, hecto, deka, meter, deci, centi and milli.

SI Units of Measurement

Length, mass, volume, density, temperature and time.

Basic SI Units

Meter, kilogram, liter, cubic centimeter, Kelvin and second.

Volume

The amount of space an object or substance takes up, the basic SI units are cubic meter or meters cubed and you can calculate solids and liquids.

Volume of Irregular Solids

You immerse the object in water and measure how much the water level rises.

Volume of Rectangular Solids

You use cubic meters or centimeter to measure it and to calculate it is by multiplying length times width times height.