Terms Flashcards
What is the unique numerical identifier assigned to every chemical substance by the Chemical Abstracts Service?
Chemical Abstracts Service (CAS) Number
What term describes the maximum concentration of a substance in the air that poses an immediate threat to life, causes irreversible health effects, or impairs an individual’s ability to escape?
Immediately Dangerous to Life or Health (IDLH)
What are the occupational exposure limits set by NIOSH to prevent long-term health effects from hazardous substances?
Recommended Exposure Limits (RELs)
What term refers to the average exposure to a chemical or hazardous substance over an 8-hour workday?
Time-Weighted Average (TWA)
What is the term for the maximum concentration of a hazardous substance to which workers can be exposed for a short period (usually 15 minutes) without adverse health effects?
Short-Term Exposure Limit (STEL)
What is the OSHA-established maximum amount or concentration of a substance in the air that a worker can be exposed to, typically averaged over an 8-hour shift?
Permissible Exposure Limit (PEL)
What term describes the mass of a molecule, calculated by adding the atomic weights of all atoms present in the molecule?
Molecular Weight (MW)
What property indicates the temperature at which a liquid turns into a gas at standard atmospheric pressure?
Boiling Point (BP)
What is the measure of how well a substance dissolves in a solvent, usually water?
Solubility (Sol)
What term describes the lowest temperature at which a liquid can form an ignitable mixture in air near its surface?
Flash Point (Fl.P)
What is the measure of the energy required to remove the most loosely bound electron from an isolated gaseous atom or molecule?
Ionization Potential (IP)
What is the ratio of the density of a substance to the density of water?
Specific Gravity (Sp.Gr)
What term refers to the ratio of the density of a gas compared to air, indicating whether it will rise or settle?
Relative Gas Density (RGasD)
What measures the pressure exerted by a vapor in equilibrium with its liquid or solid form at a given temperature?
Vapor Pressure (VP)
What is the temperature at which a liquid becomes a solid under standard atmospheric pressure?
Freezing Point (FRZ)
What is the temperature at which a solid changes into a liquid under standard atmospheric pressure?
Melting Point (MLT)
What is the highest concentration of a gas or vapor in air above which the mixture is too rich to ignite?
Upper Explosive Limit (UEL)
What is the lowest concentration of a gas or vapor in air below which the mixture is too lean to ignite?
Lower Explosive Limit (LEL)
What term describes the smallest concentration of a combustible substance (such as dust) suspended in air that can propagate a flame when exposed to an ignition source?
Minimum Explosive Concentration (MEC)
What is the unique numerical identifier assigned to every chemical substance by the Chemical Abstracts Service?
Chemical Abstracts Service (CAS) Number
What term describes the maximum concentration of a substance in the air that poses an immediate threat to life, causes irreversible health effects, or impairs an individual’s ability to escape?
Immediately Dangerous to Life or Health (IDLH)
What are the occupational exposure limits set by NIOSH to prevent long-term health effects from hazardous substances?
Recommended Exposure Limits (RELs)
What term refers to the average exposure to a chemical or hazardous substance over an 8-hour workday?
Time-Weighted Average (TWA)
What is the term for the maximum concentration of a hazardous substance to which workers can be exposed for a short period (usually 15 minutes) without adverse health effects?
Short-Term Exposure Limit (STEL)
What is the OSHA-established maximum amount or concentration of a substance in the air that a worker can be exposed to, typically averaged over an 8-hour shift?
Permissible Exposure Limit (PEL)
What term describes the mass of a molecule, calculated by adding the atomic weights of all atoms present in the molecule?
Molecular Weight (MW)
What property indicates the temperature at which a liquid turns into a gas at standard atmospheric pressure?
Boiling Point (BP)
What is the measure of how well a substance dissolves in a solvent, usually water?
Solubility (Sol)
What term describes the lowest temperature at which a liquid can form an ignitable mixture in air near its surface?
Flash Point (Fl.P)
What is the measure of the energy required to remove the most loosely bound electron from an isolated gaseous atom or molecule?
Ionization Potential (IP)
What is the ratio of the density of a substance to the density of water?
Specific Gravity (Sp.Gr)
What term refers to the ratio of the density of a gas compared to air, indicating whether it will rise or settle?
Relative Gas Density (RGasD)
What measures the pressure exerted by a vapor in equilibrium with its liquid or solid form at a given temperature?
Vapor Pressure (VP)
What is the temperature at which a liquid becomes a solid under standard atmospheric pressure?
Freezing Point (FRZ)
What is the temperature at which a solid changes into a liquid under standard atmospheric pressure?
Melting Point (MLT)
What is the highest concentration of a gas or vapor in air above which the mixture is too rich to ignite?
Upper Explosive Limit (UEL)
What is the lowest concentration of a gas or vapor in air below which the mixture is too lean to ignite?
Lower Explosive Limit (LEL)
What term describes the smallest concentration of a combustible substance (such as dust) suspended in air that can propagate a flame when exposed to an ignition source?
Minimum Explosive Concentration (MEC)
