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a tall narrow container with a volume scale used especially for measuring liquids

https://www.merriam-webster.com/dictionary/graduated%20cylinder

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The triple beam balance is a rugged, inexpensive weighing instrument. It is named for the three beams which carry weights.
A. The middle beam reads only in 100 g increments.
B. The far beam reads only in 10 g increments.
The weights in each of these must always sit in a "notch". They cannot be placed at arbitrary points on the beam.
C. The weight on the front beam can be placed to read continuously from 0 to 10 grams.

http://genchem.rutgers.edu/balance3b.html

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A measure of how much mass is contained in a given volume.

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The amount of space an object takes up.

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A measure of the amount of matter an object contains.

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An experiment in which only one variable is manipulated at a time.

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(Systeme International d'Unites) International System of Units; a version of the metric system used by scientists all over the world.

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The one factor that a scientist changes during an experiment; also called independent variable.

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The factor that changes as a result of changes to the manipulated, or independent, variable in an experiment; also called dependent variable.

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The action or process of closely observing or monitoring something or someone.

en.oxforddictionaries.com/definition/observation

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A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.

en.oxforddictionaries.com/definition/hypothesis

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The ongoing process of discovery in science; the diverse ways in which scientists study the natural world and propose explanations based on evidence they gather.

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A conclusion reached on the basis of evidence and reasoning.

en.oxforddictionaries.com/definition/inference