It depends, if you are doing an experiment on temperatures of water in nature, you will need it. If you are doing an experiment on how fast different species of turtles can walk, you don't.
The same way you use a non-science thermometer.
A thermometer is used to find the temperature of something, being used in science or not.
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If you wish to write an essay about a science experiment, you should describe the purpose of the experiment, and the way in which the experiment was performed, and the results of the experiment, and the conclusions that are drawn from those results. If you want to be fancy, you might also describe what further experiments may be needed to continue to explore the subject of the first experiment.
a thermometer
Temperature is typically measured using a thermometer, which can be a physical device like a mercury or digital thermometer, or a non-contact device like an infrared thermometer. Temperature can also be measured using a thermocouple or a thermistor.
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You could get it at the Cabrillo Marine Aquarium in San Pedro, California.
To study how air pressure in a basketball changes with temperature, you will need a pressure gauge to measure the air pressure inside the basketball accurately. Additionally, you will require a thermometer to monitor the temperature of the basketball during the experiment.
in a science experiment many things are measured. it depends on what experiment one is conducting.
which experiment
A control group is the unaffected group in a science experiment.