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

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

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A triple beam balance is a device used to measure the mass of an object, so he can use it to measure the mass of his block.
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)
www.merriam-webster.com/dictionary/density

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In scientific terms, volume is three-dimensional space occupied by a gas, liquid or solid. Scientists measure volume in cubic units, such as liters, cubic meters, gallons and ounces. The most common equation to find volume is mass divided by density.
www.reference.com/science/scientific-definition

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In science, mass is the amount of matter an object has. Newton's second law says that mass is the property of matter that determines the force required to impart a given acceleration to an object.
www.reference.com/science/mass-science

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a unit of measurement that is part of a system used for scientific and technical work all over the world
ictionary.cambridge.org/dictionary/english/si-unit

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

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A dependent variable is what you measure in the experiment and what is affected during the experiment. The dependent variable responds to the independent variable. It is called dependent because it "depends" on the independent variable. In a scientific experiment, you cannot have a dependent variable without an independent variable.

https://labwrite.ncsu.edu/po/dependentvar.htm

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A manipulated variable is the independent variable in an experiment. It’s called “manipulated” because it’s the one you can change. In other words, you can decide ahead of time to increase it or decrease it. In an experiment you should only have one manipulated variable at a time.
http://www.statisticshowto.com/manipulated-variable/

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an assumption or concession made for the sake of argument
/www.merriam-webster.com/dictionary/hypothesis.

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based his observations on his own research
www.merriam-webster.com/dictionary/observation

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

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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.
( text book page #13)