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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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Triple beam balance is an instrument used to measure mass very precisely. The device has reading error of +/- 0.05 gram. The name refers to the three beams including the middle beam which is the largest size, the front beam which is the medium size, and the far beam which is the smallest size.
***https://www.google.com.hk/search?q=definition+of+triple+beam+balance&oq=definition+of+triple+bea&aqs=chrome.0.0j69i57j0l4.9968j0j4&sourceid=chrome&ie=UTF-8

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Density is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass). Another way to put it is that density is the amount of mass per unit of volume. If an object is heavy and compact, it has a high density. If an object is light and takes up a lot of space, it has a low density.
***http://study.com/academy/lesson/density-lesson-for-kids-definition-facts.html

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Volume refers to the amount of space the object takes up. In other words, volume is a measure of the size of an object, just like height and width are ways to describe size.
***http://study.com/academy/lesson/what-is-volume-in-science-lesson-for-kids.html

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Mass is a measurement of how much matter is in an object. Mass is a combination of the total number of atoms, the density of the atoms, and the type of atoms in an object.
***http://www.ducksters.com/science/physics/mass_and_weight.php

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A complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (can).
***http://dictionary.kids.net.au/word/SI_system

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In the scientific method, an experiment is a set of actions and observations, performed to verify or falsify a hypothesis or identify a causal relationship between phenomena. The experiment is a cornerstone in empirical approach to knowledge.
***http://encyclopedia.kids.net.au/page/co/Controlled_experiment

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A dependent variable is a variable that you can  observe and measure. You have no control over the dependent variable.
***http://keydifferences.com/wp-content/uploads/2016/05/dependent-vs-independent-variable-thumbnail.jpg

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A variable that you can control.
***http://keydifferences.com/wp-content/uploads/2016/05/dependent-vs-independent-variable-thumbnail.jpg

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A possible explanation for a set of observations or answer to a scientific question; must be testable.
***Textbook

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The process of using one or more of your senses to gather information.
***Textbook

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The process of making a inference, an interpretation based on observations and prior knowledge.
***Textbook

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Scientific inquiry refers to the diverse ways in which scientists study the natural world and propose explanations based on the evidence they gather.
***Textbook