Balance: an instrument for determining mass by the equilibrium weights suspended from opposite ends of a horizontal bar.

Calibrate: to divide with graduations of measurement.

Compare: to examine for similarities and differences.

Contrast: to compare to show differences.

Cubic centimeters: a unit of linear measurement (centimeters) that is multiplied by itself twice to form a unit of measure for volume.

Density: the ratio of mass of an object to its volume (D=M/V)

Displacement: an object pushes aside (displaces) amount of liquid in a container by taking up the space the liquid once held.

Fair Test: to conduct a scientific test where there are specific items that remain constant.

Float: objects that are less dense than water that overcome the force of gravity.

Formula: a rule expressed in algebraic symbols.

Level: a horizontal position or condition.

Mass: the amount of matter in an object (grams).

Plasticine: a claylike substance.

Serial order: arranged in a series of detailed plan for reaching a goal.

Volume: an amount of space occupied by an object (cm³).

Weight: the measure of gravitational pull on an object.

Zeroing: to aim at the exact center.

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