Any material or substance, which even in normal use, poses a risk to health, safety, property or the environment. Hazardous materials are broken down into nine primary classes by the United Nations, the USDOT, IATA and other regulatory bodies for the purposes of the placarding and identification the hazards of shipments.
the conclusion that it is impossible to know simultaneously the absolute exact position and the absolute exact speed of a particle such as an electron. The more precisely the position is known of a particle at a moment in time, the less precisely can its speed be determined. Conversely the more precisely the exact speed of a particle is known, the less precisely its position can be known. Werner P. Heisenberg, a German physicist, developed this principle from his work with quantum mechanics. He was awarded the Nobel Prize in physics in 1932 for his brilliant work.
As a side note, Star Trek fans will every now and then hear the crew refer to the "Heisenberg compensator" in the transporter pads. This is the writer's nod to this principle and the problems it would create for actually being able to teleport something they way they do in the Star Trek series.
A mixture or material consisting of more than one substance. The earth's atmosphere is heterogeneous in that it typically consists of 20.7% oxygen, 78% nitrogen, 0.93% argon and 0.03% CO2 with other gasses making up the remaining percentage. Heterogeneous is Latin for "different kinds".
A substance or material that contains only one kind of compound or one element. Homogeneous is Latin for "the same kind". An example of a homogeneous substance would be pure water, which only contains the compound H2O or pure table salt that only contains the compound NaCl.
A viscous polysaccharide found in the connective tissue space and the synovial fluid of movable joints and the humors of the eye; it protects tissue.
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Kenneth Barbalace. Chemistry & Environmental Dictionary - Half-life - Hyaluronic acid. EnvironmentalChemistry.com. 1995 - 2020. Accessed on-line: 1/23/2020