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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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A triple beam balance is a really useful piece of laboratory equipment that you can use to find the mass of an object. (http://study.com/academy/lesson/triple-beam-balance-definition-use.html)

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The quantity of mass per unit volume of a substance. (https://en.oxforddictionaries.com/definition/density)

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The amount of space that a substance or object occupies, or that is enclosed within a container. (https://en.oxforddictionaries.com/definition/volume

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A large body of matter with no definite shape. (https://en.oxforddictionaries.com/definition/mass)

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SI System (International System of Units)

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SI System (International System of Units)

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A system of physical units (SI units) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten. (https://en.oxforddictionaries.com/definition/international_system_of_units

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A complex experiment including one or more control experiments or blank determinations along with the actual experimental tests (https://www.merriam-webster.com/dictionary/controlled%20experiment

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A variable (often denoted by x) whose variation does not depend on that of another. (https://en.oxforddictionaries.com/definition/independent_variable)

Basically, a variable that can be changed.

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A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation. (https://en.oxforddictionaries.com/definition/hypothesis

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Refers to the diverse ways in which scientists study the natural world and propose explanations based on the evidence they gather. (Textbook)

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Using one or more senses to gather information. (My Notebook)

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A conclusion reached on the basis of evidence and reasoning.
(https://en.oxforddictionaries.com/definition/inference)

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A variable (often denoted by y) whose value depends on that of another. (https://en.oxforddictionaries.com/definition/dependent_variable)
Basically, a variable that cannot be changed.