# Understanding Laboratory Measurements: Units & Types

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• 0:03 Using Standard Units
• 1:20 Type of Measurement Units
• 4:34 Lesson Summary

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Lesson Transcript
Instructor: Sarah Friedl

Sarah has two Master's, one in Zoology and one in GIS, a Bachelor's in Biology, and has taught college level Physical Science and Biology.

There are many different units that can be used for measurements. This may not only lead to incorrect data measurements, but also to confusion about which units are most appropriate. Therefore, a standard set of units is used for each type of measurement in the biology lab.

## Using Standard Units

Take a look around you - you are surrounded by a variety of objects that come in all shapes and sizes. There are likely just as many ways that you can measure each of these objects. You can measure their lengths, the area they take up, their volumes, masses, weights, even their densities.

Each of these measurements also has many possible units. For example, you can measure length in feet, yards, inches, meters, miles, and kilometers. Volume can be measured in units such as liters, ounces, and cubic centimeters. Can you see how this gets very confusing very quickly? If you didn't have a standard unit for each of these, you'd end up doing a lot of converting between them. And each time you convert, you lose some accuracy in your measurement because you probably round the numbers a little as well.

So what's a scientist to do? Well, we certainly can't NOT measure things; that's a key component of working in the biology lab. Collecting and analyzing data requires accurate and understandable measurements, so in order to ensure the best data collection possible, we use a standard set of units called the metric system. Most other countries in the world use the metric system for their measurements, and any good biological data should be measured using these units, regardless of the types of measurement you are taking.

## Types of Measurement Units

You may or may not already be familiar with the metric system, but the good news is that, even if you have never seen it before, it's quite simple to use. There are specific units to use for each type of measurement, so you never have to guess at which one will be best. Let's take a look at which units in the metric system are standard for the different types of measurements you'll encounter in the biology laboratory.

First let's start with length. In biology, the standard unit of this type of measurement is the meter, represented by a lower-case 'm.' In general, a meter is about the same as 3 feet, but not exactly. It's more like 3.28 feet, but even that is a rounded number. Think that 0.28 feet isn't important? It may not be for one meter, but if you have 10 meters and you round off that 0.28 feet each time, you end up rounding a total of 2.8 feet away - and that's almost an entire meter!

Area is also measured in meters because area is squared length. So if you have an area that is 3 meters by 5 meters, your area is 3m x 5m, or 15 m^2. Interestingly, though the definition of the meter has since been changed, the length of a meter was originally intended to represent one ten-millionth of the distance on Earth from the equator to the North Pole!

The standard unit for volume is the liter, represented by an upper-case 'L'. One liter is about the same as 33 ounces, but again, not quite. A more accurate conversion is 33.81 ounces in each liter, or about 4 cups. See how quickly this gets messy? This is exactly why we stick with one unit for each type of measurement, in this case, the liter.

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