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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.

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Triple beam balance is an instrument used to measure mass very precisely.

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The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

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Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains.

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In physics, mass is a property of a physical body. It is the measure of an object's resistance to acceleration (a change in its state of motion) when a net force is applied.

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The International System of Units (abbreviated as SI, from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement

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A controlled experiment is a scientific test done under controlled conditions, meaning that just one (or a few) factors are changed at a time, while all others are kept constant.

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A responding variable is the component of an experiment that responds to change.

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The independent variable, also known as the manipulated variable, lies at the heart of any quantitative experimental design.

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A hypothesis (plural hypotheses) is a proposed explanation for a phenomenon.

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Observation is the active acquisition of information from a primary source.

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Inferences are steps in reasoning, moving from premises to conclusions.

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