# Basic Math for Adults/Measurements

# Measurements

edit## Converting English Measurements

editHere are some conversions that you should know in the English system:

### Length

edit- 1 foot = 12 inches

1 yard = 3 feet

1 mile = 5280 feet

1 gallon = 16 cups

1 gallon = 4 quarts

### Mass

edit1 pound = 16 ounces

1 ton (in United States) = 2000 pounds

## The Metric System

edit**Metric system** is based on the SI (Système International d'Unités) units.

### Length

edit**Length**is measured in meters (m). There are 100 centimeters (cm) in 1 meter, and 10 millimeters (mm) in each centimeter. Therefore, there are 1000 millimeters in each meter. There are 1000 meters in each kilometer (km).

### Mass

edit**Mass**is measured in kilograms (kg). The kilogram was originally defined as the mass of one liter of pure water at a temperature of 4 degrees Celsius and standard atmospheric pressure.

### Time

edit**Time**is measured in seconds (s). Second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the Cesium-133 atom at zero kelvins. There are 60 seconds in a minute, 3600 seconds in an hour (or 60 minutes), and 86,400 seconds in a day (or 24 hours, or 1,440 minutes). There are 1000 milliseconds in a second.

### Temperature

edit**Temperature**is measured in**Kelvins**or**degrees Celsius**(°C) in SI; the latter is used more frequently in general applications. The degree Celsius is a unit of temperature named after the Swedish astronomer Anders Celsius (1701–1744), who first proposed a similar system in 1742. The Celsius temperature scale was designed so that the freezing point of water is 0 degrees Celsius, and the boiling point is 100 degrees Celsius at standard atmospheric pressure.

### Volume

edit**Volume**is measured cubic meter (m^{3}). The volume of a solid object is a numerical value given to describe the three-dimensional concept of how much space it occupies. One-dimensional objects (such as lines) and two-dimensional objects (such as squares) are assigned zero volume in the three-dimensional space. Liter (L and l) is used commonly. 1000 L makes a cubic meter and 1 L is 1 dm³.

## Metric Length Measurement Conversions

edit1 meter = 10 decimeters = 100 centimeters = 1000 millimeters

1 decimeter = 10 centimeters = 100 millimeters

1 centimeter = 10 millimeters

1 kilometer = 1000 meters = 10,000 decimeters = 100,000 centimeters = 1,000,000 millimeters

1 kilogram = 1000 grams = 1,000,000 milligrams

1 gram = 1000 milligrams

## Measure Metric Quantities

edit## Converting English and Metric Measurements

editTo convert between one measurement unit and another, requires a conversion factor. For instance;

1 inch = 2.54 cm or 25.4mm

and so 12 inches = 12 x 25.4 = 304.8mm

The same conversion factor can also be used to convert mm to inches by using division. For example;

400mm = 400/25.4 = 15.75 inches (to 2 decimal places)