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The SI system, also called the metric system, is used around the world. There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).

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The relative capacity of an atom, molecule, or radical to undergo a chemical reaction with another atom, molecule, or compound.

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A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.

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A property or characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed: Combustibility is an important chemical property to consider when choosing building materials.

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A usually reversible change in the physical properties of a substance, as size or shape: Freezing a liquid is a physical change. Compare chemical change. On matter and ether, and the secret laws of physical change.

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A physical property is any property that is measurable, whose value describes a state of a physical system. The changes in the physical properties of a system can be used to describe its transformations or evolutions between its momentary states.

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The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. Density is mass/volume.

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The meniscus is the curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension. It can be either concave or convex, depending on the liquid and the surface.

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Physical substance in general, as distinct from mind and spirit;that which occupies space and possesses rest mass, especially as distinct from energy.

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To slope is to incline vertically in an oblique direction.

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In statistics, the most frequently appearing value in a set of numbers or data points.

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Median means middle. In the study of statistics, the median is just one way of determining the average of group of numbers. The three most common 'Averages' in statistics are: The mean is what is most commonly thought of as the 'average.'

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A Systematic knowledge of the physical or material world gained through observation and experimentation

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An axis is a real or imaginary line on which something rotates, or a straight line around which things are evenly arranged.

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A dependent variable is the variable being tested in a scientific experiment. The dependent variable is 'dependent' on the independent variable. As the experimenter changes the independent variable, the change in the dependent variable is observed and recorded.

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n independent variable defines as the variable that is changes or controlled in a scientific experiment. It represents the cause or reason for an outcome. Independent variables are the variables that the experimenter changes to test their dependent variable.

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A scientific law is a statement based on repeated experimental observations that describes some aspects of the universe.

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A scientific theory is a well- substantiated explanation of some aspect of the natural world, based on a body of facts that have been through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.

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A systematic description of an object or phenomenon that shares important characteristics with the object or phenomenon. Scientific models can be material, visual, mathematical, or computational and are often used in the construction of scientific theories.

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A measure of the warmth or coldness of an object or substance value. The temperature of two systems is the same when systems are in thermal equilibrium.

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Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparative dense material will have less volume that an object of equal mass made from some less dense substance.

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The amount of space occupied by three-dimensional object or region of space. Volumes are expressed in cubic units. A measure of the loudness or intensity of a sound.

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In physics, the property of matter that measures its resistance to acceleration. Roughly, the mass of an object is a a measure of the number of atoms in it. The basic unit of measurement for mass is the kilogram.