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All values refer to 25 °C and to the thermodynamically stable standard state at that temperature unless noted. Values from CRC refer to "100 kPa (1 bar or 0.987 standard atmospheres)". Lange indirectly defines the values to be standard atmosphere of "1 atm (101325 Pa)", although citing the same NBS and JANAF sources among others.
The (s) notation indicates equilibrium temperature of vapor over solid. Otherwise temperature is equilibrium of vapor over liquid. log10 of anydrous ammonia vapor pressure. Uses formula shown below. Vapor-pressure formula for ammonia: [4] log 10P = A – B / (T − C), where P is pressure in k Pa, and T is temperature in kelvins;
e. In thermodynamics, heat is the thermal energy transferred between systems due to a temperature difference. [ 1 ] In colloquial use, heat sometimes refers to thermal energy itself. Thermal energy is the kinetic energy of vibrating and colliding atoms in a substance. An example of formal vs. informal usage may be obtained from the right-hand ...
Since 1982, STP has been defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 10 5 Pa (100 kPa, 1 bar). 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).
The table below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure. Units of solubility are given in grams of substance per 100 millilitres of water (g/ (100 mL)), unless shown otherwise. The substances are listed in alphabetical order.
The British thermal unit (Btu) is a measure of heat, which is a form of energy. It was originally defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. It is also part of the United States customary units. [1] The SI unit for energy is the joule (J); one Btu equals about 1,055 J (varying ...
Sulfur is an essential component of all living cells. It is the eighth most abundant element in the human body by weight, [ 100 ] about equal in abundance to potassium, and slightly greater than sodium and chlorine. [ 101 ] A 70 kg (150 lb) human body contains about 140 grams (4.9 oz) of sulfur. [ 102 ]
These data correlate as ρ [g/cm3] = −8.461834×10−4T[°C] + 0.8063372 with an R2= 0.99999. Properties of aqueous ethanol solutions. [edit] Data obtained from Lange 1967. Mass fraction, Volume concentration, Mass concentration, g/(100 ml) at 15.56 °C. Density relative to 4 °C water [citation needed] Density at 20 °C relative to 20 °C water.