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Table o f C on te n ts Asking Questions and Researching Forming a Hypothesis Gathering Materials Trials and Variables Experimenting Results and Conclusion Sharing Discoveries with the World Glossary Index
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Asking Questions and Researching Hmm…do you ever wonder? Scientists wonder, or have questions about lots of things. When scientists have questions they want to answer, they go through a process to find a solution.
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Scientists start with a question. Then they research information about their question, or problem.
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Jayme thinks like a scientist and asks many questions. Today she’s wondering, “What brand of bubble bath makes the most bubbles?” Jayme uses books and the internet to look for information about bubbles. She learns how bubbles form and the different solutions used to make them. 7
Forming a Hypothesis
Next, scientists make a thoughtful guess, or hypothesis. The hypothesis is what scientists think the answer might be to the question they are asking. 8
Jayme chooses three brands of bubble bath to compare. She makes the hypothesis that the most expensive brand of bubble bath will make the most bubbles. 9
Gathering Materials
Gathering materials and performing the experiment are the next two steps in the process. Scientists gather their materials, set up the experiment, and then do the experiment to test their hypothesis. 10
Materials Jayme Needs • Three clear 1 liter containers labeled A, B, C • Three different kinds of bubble bath labeled A, B, C • Water • Straws • Timer • Ruler
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Trials and Variables
During experiments, scientists always perform tests several times. They call these tests trials. In each trial, scientists change only one thing. 12
Jayme puts the same amount of water and bubble bath in each container for each test. The only change, or variable, is the brand of bubble bath she uses. 13
Experimenting
Scientists keep journals as they research and experiment. They record important information, numbers, charts, graphs, observations, and results. 14
Steps for Testing Bubble Bath 1. Pour 100 ml of water into the container labeled A. Pour 10 ml of bubble bath A into the same container. 2. Put the straw into the mixture and blow for 5 seconds. 3. Measure the height of the bubbles using a ruler. Start from the water line. 4. Repeat steps one through three for bubble baths B and C. 5. Repeat the trial two more times. 6. Record the results each time on the chart.
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Next, Jayme follows the steps and performs the experiment.
Put straw in container
Blow for 5 seconds
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Measure bubbles starting from the water line
Repeat on other containers
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Results and Conclusion
After each test, scientists record their results. They use charts and graphs to show what they learned during the experiments.
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Results for Bubble Bath Experiment Bubble Bath
Trial 1
Trial 2
Trial 3
6 cm
9 cm
8 cm
(Most expensive)
5 cm
6 cm
5 cm
C
6 cm
3 cm
4 cm
A (Least expensive)
B
Jayme uses the computer to create a chart for reporting her bubble bath results.
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Forming conclusions is the next step in the process. A scientist’s conclusion is what the scientist learned from the results of the experiment. 20
Jayme’s hypothesis is incorrect. In most of the trials, bubble bath A, the lowest-priced brand, made the greatest amount of bubbles. What a surprise! 21
Sharing Discoveries with the World
Scientists write reports and give talks so everyone can benefit from what