In the trades we may get used to a certain way of doing things but understanding the terminology behind systems of measurement can help us when we work at jobs where the language is different. Once again, what we are doing is expanding our math vocabulary to help us understand the language of math.
I’ll give you an example. When gas fitters learn about energy (or heat) calculations, they are given two numbers to work with. The imperial number is the British Thermal Units (BTU’s) while the metric version is kilowatts (kW). Students often have a tough time in the beginning getting the relationship right between the two. Their frustration builds and eventually they begin to wonder why they have to learn two different ways to say the same thing in the first place.
The answer lies in the fact that in the gas fitting trades, students will run across appliances that are designated in both BTU’s and kW’s. If they are unable to work between the two, then there could be serious safety consequences if those appliances receive too little or, more importantly, too much gas.
For reasons such as the one mentioned above, it’s important to know what the different units of measurement mean as well as how to work between them. I know from my experience as a trades instructor that once students begin to understand the language of measurement and are able to both visualize and apply this language, the concepts of math and measurement become a lot easier.
I think the first thing we should do at this point is go through the history of measurement and how the metric and imperial systems came to be.
A Brief History of Measurement: Metric and Imperial
Have you ever heard of the guy on the right? Nope, me neither. His name is Nicolas de Condorcet, and he was a French mathematician, philosopher, and early political scientist. He lived way back in the 1700’s.
What does he have to do with measurements, you might ask? Well, Condorcet stated that the metric system was to be “for all people all the time.”
Back in those days there wasn’t a standard measuring system being used in France (or probably anywhere in Europe for that matter), and they were bouncing ideas back and forth as to what measuring system they should use. The basic units being used for the metric system were taken from the natural world. A metre was a unit of length and was based on the dimensions of the earth while the unit of mass, the kilogram, was based on the mass of water which was contained in one liter.
The metric system was used, then not used, then used, then not used and then finally adopted in 1837 by France. During this time period, the metric system was also adopted by the scientific community. The metric system continued to be revised, updated, and adopted by different countries and agencies in the years that followed until it reached the model that is currently used today.
Canada is officially under the metric system, but in many circumstances, we also use the imperial system to measure stuff. This might be due to the fact that we are quite close to the United States, which uses the imperial system.
Based on the meter for length and kilogram for mass, the metric system was first adopted in France in 1795. After the French Revolution, the government asked scientists to look into replacing thousands of different traditional measurement systems with one that could unify the country. The meter was developed by measuring one-ten-millionth of the quadrant of Earth’s circumference running from the North Pole to the equator, through Paris. The new unit, equal to about thirty-nine inches, was called a meter, and all measurements were based upon it.
The metric system, or SI (Système International), is based off this original meter and currently the official system of measurement for almost all countries, including the countries of the former British Empire, such as Australia. (Canada converted to the metric system in the ’70s and ’80s.) The SI units—fundamental units not based on any other units—are meter, kilogram, second, ampere (electricity), Kelvin (although Celsius is a more practical measurement for nonscientific applications), mole (chemistry), and candela (luminous intensity).