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Science Project terms can be a really hard part of science. You'll probably run across a lot of new vocabulary while doing a science project. Some of the things below will be required for your science project, and others will not. We recommend you print this page and highlight the things your teacher wants you to do.

To help explain some of the unfamiliar terms, we're going to refer to the following experiment.

"What type of fertilizer produces the most plant growth?"
Project summary: A group of plants of the exact same height is divided into five groups. Each of four groups is given a different type of fertilizer. The fifth group is given only water. At the end of one month, plants are measured.

Science Project Proposal - This is a short description of your science project. It needs to include your purpose, hypothesis, materials, and procedure. Your teacher may also want you to list the variables, and give places where you will do research. Turn it in as early as you can, in case it is rejected.

Purpose (Problem) - The purpose is what your project hopes to find out or prove. It's the 'big question'. What is your goal? What are you trying to test? That's your purpose, sometimes stated as a problem. The purpose of our science project is to find out, "What type of fertilizer produces the most plant growth?"

Hypothesis - An hypothesis is simply an educated guess about what will happen in your experiment. To form your hypothesis, take all the information you know about your science project question, and use it to predict what you think will happen. It doesn't matter if you're right or wrong; that's what the experiment will tell you! In our experiment, the hypothesis will be, "I think that …. will make plants grow the highest." Use what you know about fertilizer, advertisements, comments from a gardener you know, or personal experience to formulate your hypothesis.

Materials - This is a detailed list of exactly what you used (or plan to use) in your experiment:
  • Four types of liquid houseplant fertilizer -Peters Professional® All Purpose Plant Food, Spectrum® Colorburst Plant Food, Osmocote® Indoor Outdoor Plant Food, and Miracle-Gro® All Purpose Plant Food
  • 20 identical terra cotta pots filled with potting soil
  • 20 bush bean plants of identical height
  • Water
  • Ruler
Procedure - A step by step description of how to do your experiment. Another person should be able to do your experiment again, just by following your procedure.

Variables - When doing a science experiment, there are things that you, as the scientist, control to make sure your test results are dependable:
  • Independent Variable - The independent variable is the thing that you change in the experiment. All the other things in your experiment should stay the same. For example, in our experiment the independent variable is the type of fertilizer. We'll use the same kind of pot, soil, and plant. We'll have the plants get the same amount of light and stay in the same room at the same temperature. We'll add the same amount of water. The only thing that will change is the kind of fertilizer.
  • Dependent Variable - The dependent variable is the thing that changes because of the independent variable. For us, that would be the height of the plant. The height of the plant changed because we changed the type of fertilizer.
  • Control - The Control is the group in which nothing changes at all. In the fertilizer experiment, that would be the group of plants that only was given water with no fertilizer.
Metric Measurements - Sometimes teachers require students to do all measurements in metrics, which is a decimal system of measurement based on:
  • The Meter - measures length. The English system uses yards, feet, and inches. One meter equals 39.37 inches.
  • The Kilogram - measures mass, or the amount of matter present. It's not the same thing, but you can relate mass to weight. The English system measures mass in pounds and ounces. A pound is 2.2 kilograms.
  • The Liter - measures capacity or volume. The English system uses gallons, quarts, teaspoons, tablespoons, ounces - and 2 liter bottles! An American gallon is 3.8 liters.
If you have to convert English measurements to Metrics, go to Google and type in "convert 2 inches to meters", or whatever you need to convert. Sometimes, you don't even have to think!

Science Log - A journal of what happened in your experiment, from day to day or minute to minute. In our experiment, an entry might read, "On day five, we noticed that the plants with fertilizer had really started getting taller than the control that was only getting water." Or..."On day seven, we noticed that the plants getting ... brand fertilizer had started to wilt a bit." If you are doing one of our 24 Hour Science Projects, your log will record changes at much more frequent intervals. You will often need to keep a graph of data in your log. In our experiment, the graph might look like the one at the right. Obviously, the graph would extend to include all the days. You would measure and fill in the height of each plant daily.

Graph - The words chart and graph are used interchangeably. We use the word "graph" for a numbers placed on a grid (or spreadsheet) like the one at the right. And a chart...

Chart - A chart arranges the information (data) from your experiment visually, so you can see it. Look at the charts below. The first gives all the heights of the plants on the last day. The second gives the average height.

Bald Egg Science Project

24 Hour Science Projects

We're here to help you understand all those science project terms.