CFD Hazmat Properties/Effects

State of matter physical properties

Physical change is essentially a change of state. Chemical change results in the alteration of the chemical nature of the material

Temperature at which a liquid will continually give off vapours in sustained amounts and if held at that temperature long enough will eventually turn completely into a gas

When the flashpoint is surpassed the fuel will give off sufficient vapour to support combustion ie the flame point

- A wide range tends to increase the danger of a material - as a vapour cloud expands outward the liklihood of a flammable mixture increases

Density of a gas relative to air assigned a value of 1 .: Tells us how a gas will stratify Hydrogen Ammonia Helium Acetylene Methane Illuminating gas (Neon, HCN) Nitrogen CO Ethylene

Pertains to liquids When in a closed container a certain amount of a liquid will vapourize to determine pressure in the container. = the pressure exerted by its vapour until the liquid and the vapour are in equilibrium * relates to volatility psi, atm, torr, mm Hg

Temperature of the materials ambient temp

Density of a liquid trelative to water (assigned value of 1) H-Cs generally float on water = <1 carbon Disulfide = 2.6 specific gravity >1 .: sinks

Ability of chemicals to mix/dissolve

Ability of a material to cause damage, on contact, to skin, eyes, or other parts on the body ie destruction or irreversible damage Acids pH= <7 bases pH=>7

More specialized ways of determining pH and may be a useful resource when handling corrosives Materials are more complicated so responses are more complicated

Nature of the fule will dictate the byproducts of combustion Phosgene, cyanide, formaldehyde, oxides of nitrogen (nitric, nitrous and dioxide) lund irritants, CO

Consists of energetic particles/waves that have the potential to ionize an atom or molecule through atomic reactions

Refers to E-M radiation that does not carry enough energy to completely remove an electron from an atom or molecule.