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A tall narrow container that measures liquid.

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Triple beam balance is an instrument used to measure mass very precisely.
***http://study.com/academy/lesson/triple-beam-balance-definition-use.html

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The distribution of a quantity (such as mass, electricity, or energy) per unit usually of space (such as length, area, or volume)
***https://www.merriam-webster.com/dictionary/density

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The amount of space occupied by a three-dimensional object as measured in cubic units.
***https://www.merriam-webster.com/dictionary/volume

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A large body of matter with no definite shape.
***https://www.merriam-webster.com/dictionary/mass

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a complete metric system of units of measurement for scientists; are length and mass and time and electric current and temperature and amount of matter and luminous intensity
***http://www.thefreedictionary.com/SI+system

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a complex experiment including one or more controlled variable.
***https://www.merriam-webster.com/dictionary/controlled%20experiment

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A mathematical variable whose value is determined by that of one or more other variables in a function.

***https://www.merriam-webster.com/dictionary/dependent%20variable

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A mathematical variable that is independent of the other variables in an expression or function and whose value determines one or more of the values of the other variables
***https://www.merriam-webster.com/dictionary/independent%20variable

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A assumption or a educated guess, for a certain situation.For Example: "My Hypothesis is that the glass is going to explode."
***https://www.merriam-webster.com/dictionary/hypothesis

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An act of recognizing or discovering something new. For Example: "Oh wow!" "Look at this moth, it has 2 brown wings and 2 antennas. Let's jot them down"
***https://www.merriam-webster.com/dictionary/observation

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A conclusion or opinion that is made by facts and evidence. For Example: "I think Harry Potter will survive because he has a special power."
***https://www.merriam-webster.com/dictionary/inference

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It's a process that scientists use to the study the natural world and make explanations based on the evidence.
***Textbook