Combustible gases vapor density

Colorless gas pungent suffocating odor human odor perception 0.5 mg/m hquefies by compression at 9.8 atm at 25°C, or without compression at -33.35°C (at 1 atm) sohdifies at -77.7°C critical temperature and pressure, 133°C and 112.5 atm, respectively vapor density 0.59 (air l) density of liquid ammonia 0.677 g/mL at —34°C dielectric constant at —34°C is about 22 extremely soluble in water solution alkaline pKa 9.25 in dilute aqueous solution at 25°C the gas does not support ordinary combustion, but bums with a yellow flame when mixed in air at 16— 27% composition. 

Boron trifluoride, BFj, is a colorless gas with a vapor density of 2.34, which is heavier than air. It is water-soluble and does not support combustion. It is also water-reactive, toxic by inhalation, and corrosive to skin and tissue. The TLV is 1 ppm, and the IDLH is 100 ppm in air. The boiling point is -148°F. The four-digit UN identification number is 1008. The NFPA 704 designation is health 4, flammability 0, and reactivity 1. The primary uses are as a catalyst in organic synthesis, in instruments for measuring neutron intensity, in soldering fluxes, and in gas brazing. 

Boiling point/C -183 Melting point/C -216 RelatiM density (water-1) see notes Relative vapor density (air -1) 1.1 Solubility In water none Relative molecular mass 32.0 Qrossformula Og COLORLESS, EXTREMELY COLD LIQUID Evaporation produces cold gas cloud which is heavier than surrounding airand spreads at ground level. Strong oxidant which reacts violently with combustible substances and reducing agents, with risk of fire and explosion. ... 

Engineering factors include (a) contaminant characteristics such as physical and chemical properties - concentration, particulate shape, size distribution, chemical reactivity, corrosivity, abrasiveness, and toxicity (b) gas stream characteristics such as volume flow rate, dust loading, temperature, pressure, humidity, composition, viscosity, density, reactivity, combustibility, corrosivity, and toxicity and (c) design and performance characteristics of the control system such as pressure drop, reliability, dependability, compliance with utility and maintenance requirements, and temperature limitations, as well as size, weight, and fractional efficiency curves for particulates and mass transfer or contaminant destruction capability for gases or vapors. 

Physical and emical Properties - Physical State at 15 XI and I atm. Liquid Molecular Weight 122.95 Boiling Point at 1 atm 169, 76, 349 Freezing Point -141.7, -96.5, 176.7 Critical Temperature Not pertinent Critical Pressure Not pertinent Specific Gravity 1.66 at 16 °C (liquid) Vapor (Gas) Density 4.24 Ratio of Specific Heats of Vapor (Gas) 1.44 Latent Heat of Vaporization 106, 59, 2.5 Heat of Combustion No data Heat of Decomposition Not pertinent. 

Physical and Chemical Properties — Physical State at 15 T7 and 1 atm. Liquid Molecular Weight Mixture Boiling Point at I atm. Decomposes Freezing Point 17, -8,265 Critical Temperature Not pertinent Critical Pressure Not pertinent Specific Gravity 1.2 at 20 °C (liquid) Vapor (Gas) Density Not pertinent Ratio cf Specific Heats cf Vapor (Gas) Not pertinent Latent Heal of Vaporization Not pertinent Heat of Combustion -15,700, -8750 -366 Heat of Decomposition -50, -28, -1.2. 

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