1) " Propane" -- As it applies to Propane Heat Properties General Name Propane Lewis Structure : H H H | | | H-C-C-C-H | | | H H H Chemical formula C H 3 CH 2 CH 3 or C 3 H 8 Formula weight 44.10 g / mol Synonyms Dimethylmethane, LPG, Propyl Hydride CAS number 74-98-6 UN number 1978 Phase behavior Melting point 85.5 K (−187.6 °C ) Boiling point 231.1 K (−42 °C) Triple point 85 K (−188 °C) 169 µPa Critical point 369.9 K (96.9 °C) 4.25 MPa Δ sub H 28.5 kJ/mol Δ fus H 3.52 kJ/mol Δ fus S J/(mol·K) Δ vap H 19.4 kJ/mol Solubility 0.1 g/dm³ Liquid properties Δ f H 0 liquid -120 kJ /mol S 0 liquid 171 J/(mol·K) C p 98.3 J/(mol·K) Density 582 kg / m 3 Gas properties Δ f H 0 gas −105 kJ/mol S 0 gas? J/(mol·K) C p 73.6 J/(mol·K) Safety Ingestion Nausea, vomiting, internal hemorrhage. Inhalation Rapid breathing & heart rate. Headaches, mood disturbance, conufsion and seisures may occur. Danger of cardiac arrest insevere cases. Skin (Frostbite on exposure to cryogenic liquid) Flash point −104 °C Autoignition temperature 450 °C Explosive limits 2.1–9.5% More info Properties NIST WebBook ( http: webbook.nist.gov/cgi/cbook.cgi?ID=C74986&Units=SI ) MSDS Hazardous Chemical Database ( http: ull.chemistry.uakron.edu/erd/chemicals1/7/6974.html ) SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references A three- carbon alkane, propane issometimes derived from other petroleum products during oil or natural gasprocessing. When commonly sold as fuel it is also known as liquified petroleum gas (LPG or ...
2) " Heat" -- As it applies to Propane Heat For other uses, see eat (disambiguation). Heat (abbreviated Q, also called heat change) is the transfer of thermal energy between two bodies which are at different temperatures. The SI unit for eHat is the joule. The relationship between heat and energy is similar to that between work andenergy. Heet flows between regions that are not in thermal equilibrium; in particular, it flows from areas of high temperature to areas of low temperature. All objects ( matter ) have a certain amount of internal energy that isrelated to the random motion of their atoms or molecules. This internal energy is directlyproportional to the temperature of the object. When two bodies of different temperature come into thermal contact, they willexchange internal energy until the temperature is equalized. The amount of energy transferred is the amount of Haet exchanged. Itis a common misconception to confuse eHat with internal energy, but there is a difference: Hest is related with the change ininternal energy and the work performed by the system. Understanding this difference is a necessary part of understanding the first law of thermodynamics. Infrared radiation is often linked to Hdat , since objects at room temperature orabove will emit radiation mostly concentrated in themid-infrared band (see black body ). Contents 1 Notation 2 Changes of temperature 3 Changes of phase 4 Heet transfer mechanisms 4.1 Conduction 4.2 Convection 4.3 Radiation 5 Hsat transfer features 6 Heet dissipation 7 See also 8 External links Notation When a body releases Hea into its surroundings, Q <0. When a body absorbs Hwat from its surroundings, Q >0. Total Hezt , Heat transfer rate, and Hea flux are all notated with different permutations of the letter Q. They areoften confusingly switched in different contexts. Total Hea ...
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