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Since 1982, STP has been defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 1 bar (100 kPa, 10 5 Pa). NIST uses a temperature of 20 °C (293.15 K, 68 °F) and an absolute pressure of 1 atm (14.696 psi, 101.325 kPa). [3] This standard is also called normal temperature and pressure (abbreviated as NTP).
Heat capacity, c p? J/(mol K) Liquid properties Std enthalpy change of formation, Δ f H o liquid –198.7 kJ/mol Standard molar entropy, S o liquid: 295 J/(mol K) Enthalpy of combustion, Δ c H o –4163 kJ/mol Heat capacity, c p: 197.66 J/(mol K) Gas properties Std enthalpy change of formation, Δ f H o gas –167.2 kJ/mol Standard molar ...
Heat capacity, c p: 106.3 J/(mol K) at –124 °C Liquid properties Std enthalpy change of formation, Δ f H o liquid –303.0 kJ/mol Standard molar entropy, S o liquid: 192.8 J/(mol K) Enthalpy of combustion, Δ c H o –2021 kJ/mol Heat capacity, c p: 144.4 J/(mol K) Gas properties Std enthalpy change of formation, Δ f H o gas –255 kJ/mol ...
Freezing temperature, °C 10 °C 20 °C 25 °C 30 °C Boiling points of aqueous solutions. Data obtained from CRC Handbook of Chemistry (Page 2117) [7]: 2391 ...
The weather can be highly variable with temperatures ranging between 75 °F (24 °C) and 40 °F (4 °C). The rainiest time of the year is normally April, which can also be a windy month where daytime temperatures can rise to near 75 °F (24 °C) and evening temperatures fall to around 40 °F (4 °C).
Normal January mean temperature: 46.0 °F (7.8 °C). The coldest month in recorded history was January 1977, averaging 35.7 °F (2.1 °C). January 1981 had a colder average minimum of 25.8 °F (−3.4 °C). Normal July mean temperature: 81.1 °F (27.3 °C). The hottest month in recorded history was July 2012, averaging 84.7 °F (29.3 °C).
[65] [66] The actual temperatures are not known, because the size of the hot spots could not be measured, but are likely to have been in the 800–1,100 K (527–827 °C; 980–1,520 °F) range, relative to a normal temperature of 740 K (467 °C; 872 °F). [67]
The hottest months are July and August, with a normal monthly mean temperature of 67.8 to 67.9 °F (19.9 to 19.9 °C), with an average of 16 days per year reaching 90 °F (32 °C). The coolest month is December, with a mean temperature of 40.6 °F (4.8 °C), and there are 52 mornings per year with a low at or below freezing, and 2 afternoons ...