Every field of science involves taking measurements, understanding them, and communicating them to others. In other words, we all have to speak the same basic language. Whether you are a chemist, a physicist, a biologist, an engineer, or even a medical doctor, you need a consistent way of communicating size, mass, shape, temperature, time, amount, energy, power, and speed. The International System of Units (abbreviated SI, from the French Système international d’unités) is the metric system used in science, industry, and medicineDepending on your age and geographic location, you might be very familiar with the “imperial” system, which includes units such as gallons, feet, miles, and pounds. The imperial system is used for “everyday” measurements in a few places, such as the United States. But in most of the world (including Europe) and in all scientific circles, the SI system is in common use.

## What is a Conversion Chart?

It is a table of equivalents for changing units of measure or weight into other units.

## Units of Measurement

There are seven base units in the SI system:

• the kilogram (kg), for mass
• the second (s), for time
• the kelvin (K), for temperature
• the ampere (A), for electric current
• the mole (mol), for the amount of a substance
• the candela (cd), for luminous intensity
• the meter (m), for distance

Basically, a conversion occurs when a website visitor completes a desired action. Which means: to calculate a conversion rate, you need to know what you’re trying to measure. It’s a matter of having clearly established business goals, and being able to translate those into quantifiable website metrics. To determine a conversion rate, divide the number of goals achieved in a given time frame by the total number of visitors to your website, then multiply that number by 100.

• Conversion rate = (Conversions or goals achieved / Total visitors) * 100

## How do the different units of measurement affect everyone?

• Body Weights: In the US body weight is measured in pounds, in the UK, and some other countries, body weight is still typically measured in stones and pounds (or kilograms)
• Drivers: When comparing gas/petrol prices, or calculating miles per gallon (MPG), make sure you use the appropriate US Gallon to Imperial Gallons (or Litres) conversion
• Cooks/Chefs: There’s a 4% difference between US and Imperial volume measurements (fluid ounces, cups, tablespoons, teaspoons) which isn’t usually an issue but be careful when translating US recipes into weights to take account of the content. For example 1 cup of flour weighs around 125 grams compared to a cup of Maple syrup at over 300 grams
• Buying heavy items: UK and US tons (and hundredweights) are different and there’s also a metric tonne (metric ton). The difference between the heaviest (UK) and lightest (US) is 11%.