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THMG Definitions


Definition: Boiling Point Temperature at which a LIQUID changes to a GAS. The closer to the boiling point, the most vapors that are produced.
Definition: Fire Point The lowest temperature at which a LIQUID with an outside source of ignition sustains burning.
Definition: Flash point The minimum temperature of a LIQUID that produces enough vapors to form an ignitable mixture with air when an ignition source is present
Definition: Volitility Is the relative quantity of vapors that come from the material versus a specific standard at a specific temperature. IN OTHER WORDS: The relative quantity of vapors that come from a material.
Definition: Relative response Term used to describe the way a monitor reacts to a gas other than its calibration gas.
Polar Solvents are? Solvent in water
Definition: Deposition What a gas forms a solid...RARE. Found in nuclear explosions.
Definition: Pyrophoric When a material is spontaneously reactive with air or water. Usually below 130 degrees F.
Definition: Polymerization When small compounds called monomers react with themselves and become polymers.
Definition: Carboy A glass or plastic bottle used to store or transport corrosive liquids. Can be as large as 20 gallons, but common is 5 gallons.
Definition: Jerrican Rectangular plastic carboys. Typically used to transport flammable and combustible liquids.
Definition: Cylinder Pressure vessel designed for higher than 40 psi
Definition: Dust Solid particle that is formed or generated from solid organic or inorganic materials.
Definition: Fume Suspension of particles that form when a material from a volatilized solid condenses in cool air
Definition: Mist Finely divided liquid suspension in the atmosphere
Definition: Aersol Form of mist characterized by highly respirable, minute liquid particles
Definition: Fiber Solid particles whose length is several times greater than its diameter
Definition: Vapor Gaseous form of a substance that is normally in a solid or liquid state at room temperature and pressure.
Definition: Vapor density Weight of a given volume of pure vapor or gas. >1 is heavier than air, <1 is lighter than air. The majority of gases are >1
Definition: Miscibility Degree or readiness to which two or more gases or liquids are able to mix with or dissolve into each other.
Definition: Specific Gravity Ratio of the density of a material to the density of a standard materials at standard conditions or pressure and temp. >1 will sink, <1 will float.
Definition: Reactivity Its relative ability to undergo a chemical reaction with another material
Definition: Inhibitor Added to products that easily polymerize in order to control or prevent an undesired reaction.
Definition: Ionization Process of removing electrons from atoms and also the method by which radiation causes damage to human body.
Definition: Melting point Temperature at which a solid becomes a liquid. This temperature is the same as when it goes from liquid to solid again.
Definition: suspension A chemical that has not dissolved in a liquid
Definition: Viscosity The resistance of a liquid to flow
What is the difference between boiling and evaporation? Evaporation is a surface phenomenon. Boiling is a bulk process.
Definition: Condensation Change of a gas to a liquid
NFPA defines a flammable liquid flash point as below... 100 degrees F
DOT defines a flammable liquid flash point as below... 141 degrees F
NFPA defines a combustible liquid flash point as between... 100 degrees and 200 degrees F
DOT defines a combustible liquid flash point as between... More than 141 degrees F
Definition: IDLH Max concentration from which an UNPROTECTED person can escape WITHIN 30 MINUTES WITHOUT ANY escape-impairing symptoms or irreversible health effects
Definition: simple asphyxiant Something that displaces oxygen
Definition: chemical asphyxiant Something that prevents the body from using oxygen.
Definition: Mutagen a physical or chemical agent that changes genetic information of an organism and thus increases the frequency of mutations.
Definition: Teratogen an agent that causes an abnormally following fetal exposure during pregnancy
Created by: yakshave