# Metric Mania: Length Measurements

### The metric meter is one of the seven SI Base Units.

## History of the Meter

## 1791 The first definition of the meter was one ten millionth of the length of the Meridian through Paris from pole to equator. This was later changed because it was 0.2 mm short due to a miscalculation. | ## 1889In 1889, a new international prototype was made of an alloy of platinum with 10 percent iridium, that was to be measured at the melting point of ice. In 1927, the meter was more precisely defined as the distance, at 0° C, between the axes of the two central lines marked on the bar of platinum-iridium kept at the BIPM. | ## 1960 In 1960 it was based upon a wavelength of krypton-86 radiation. |

## 1791

## 1889

In 1889, a new international prototype was made of an alloy of platinum with 10 percent iridium, that was to be measured at the melting point of ice. In 1927, the meter was more precisely defined as the distance, at 0° C, between the axes of the two central lines marked on the bar of platinum-iridium kept at the BIPM.

## Prefixes for SI Units

Most commonly used are **Bold**.

tera T 1000000000000

giga G 1000000000

mega M 1000000

**kilo k 1000**

**hecto h 100**

**deca da 10**

**Base 1**

**deci d 0.1**

**centi c 0.01**

**milli m 0.001**

micro μ 0.000001

nano n 0.000000001

pico p 0.000000000001

## Height of a Bookcase The height of my bookcase is 1.5 meters. This is the same as 150 cm or 1500 mm. I believe that meters is the unit of best fit, because when measured in this unit it has the least number of digits. | ## Width of a Book The width of a book is 13 cm. It is also 0.13 m and 130 mm. I believe that centimeters is the unit of best fit, because when measured in this unit it has the least number of digits. | ## Diameter of a Pencil Eraser The diameter of a pencil eraser is 1 cm, 0.01 m and 10 mm. I believe that centimeters is the unit of best fit, because when measured in this unit it has the least number of digits. |

## Height of a Bookcase

## Width of a Book

## Factor Label Method/Dimensional Analysis

Ex: _____km=1000m • 1000m/1km

1km=1000m • 1000m/1km

The numerator of the fraction that you multiply by, has the same unit as the number/numerator of the fraction before.

## Temperature You might use dimensional analysis to convert the temperature in Celsius to Fahrenheit, if you visit a foreign country. | ## Long Distances If you are doing a 3k race you might want to know how many miles it is. You could use dimensional analysis to convert the units. | ## Height If you meet someone from a foreign country and they don't know the Customary System, they might tell you how tall they are in centimeters. You could use dimensional analysis to find out their height in feet and inches. |

## Temperature

## Long Distances

## Factor Label Method Practice

**1. Measure 5 objects in inches.**

**2. Use Factor Label Method to convert the measurements to centimeters.**

**3. Then convert the measurements to miles.**

## Works Cited

*Base Unit Definitions: Meter*. N.p., n.d. Web. 13 Oct. 2015.