molecule
Combination of two or more atoms of the same chemical element (such as O2) or different chemical elements (such as H2O) held together by chemical bonds. Compare atom, ion.
Subject:
Chapter 3 - Science, Systems, Matter & Energy
model
Approximate representation or simulation of a system being studied.
Subject:
mixture
Combination of one or more elements and compounds.
Subject:
metabolism
Ability of a living cell or organism to capture and transform matter and energy from its environment to supply its needs for survival, growth, and reproduction.
Subject:
matter-recycling economy
Economy that emphasizes recycling the maximum amount of all resources that can be recycled. The goal is to allow economic growth to continue without depleting matter resources and without producing excessive pollution and environmental degradation. Compare high-throughput economy, low-throughput economy.
Subject:
matter quality
Measure of how useful a matter resource is, based on its availability and concentration. See high-quality matter, low-quality matter.
Subject:
matter
Anything that has mass (the amount of material in an object) and takes up space. On the earth, where gravity is present, we weigh an object to determine its mass.
Subject:
material efficiency
Total amount of material needed to produce each unit of goods or services. Also called resource productivity. Compare energy efficiency.
Subject:
mass number
Sum of the number of neutrons (n) and the number of protons (p) in the nucleus of an atom. It gives the approximate mass of that atom. Compare atomic number.
Subject:
mass
Amount of material in an object.
Subject:
Pages
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