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A graduated cylinder, measuring cylinder or mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid. It has a narrow cylindrical shape. Each marked line on the graduated cylinder represents the amount of liquid that has been measured.
https://en.wikipedia.org/wiki/Graduated_cylinder

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triple beam balance is an instrument used to measure mass very precisely.
https://en.wikipedia.org/wiki/Triple_beam_balance

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The relationship between the mass of a substance and its size: http://dictionary.cambridge.org/dictionary/english/density

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The amount of space that is contained within an object or solid shape:
http://dictionary.cambridge.org/dictionary/english/volume

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The amount of matter in any solid object or in any volume of liquid or gas:
http://dictionary.cambridge.org/dictionary/english/mass?q=Mass

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A unit of measurement that is part of a system used for scientific and technical work all over the world

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An experiment in which only one variable is manipulated at a time
***TextBook (Page 153)

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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.
***TextBook(page 156)

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The one factor that a scientist change during an experiment; also called independent variable
***Textbook(page 154)

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The ongoing process of discovery in science; the diverse ways in which scientist study the natural world and propose explanations based on evidence they gather.
***Textbook(pg156)

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A conclusion or opinion that is formed because of known facts or evidence.
https://www.merriam-webster.com/dictionary/inference

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An act of recognizing and noting a fact or occurrence often involving measurement with instruments weather observations
https://www.merriam-webster.com/dictionary/observation

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an idea or explanation for something that is based on known facts but has not yet been proved: http://dictionary.cambridge.org/dictionary/english/hypothesis