Steam table calorie

The international steam table calorie (cain-), used in engineering, is defined by... 

The latter is the International Steam Table calorie (cahr), one of the two calories still in use of a number of older calories (e.g., the 15 °C water calorie corresponding to 0.9996801 calix) (Stifle, 1961). 

Ibf) force to accelerate l(lbm) by 32.1740 (ft) s" atm = standard atmospheric pressure = 101 325 Pa (psia) E pounds force per square inch absolute pressure torr = pressure exerted by 1 mm mercury at 273.15 K (0°C) and standard gravity (cal) = thermochemical calorie (Btu) s international steam table British thermal unit (lb mole) s mass in pounds mass with numerical value equal to the molar mass (R) - absolute temperature in Rankines... 

What units are associated with energy If you have forgotten, refer back to -Table-lvl—No - confiision-exists -with-respect-tO-the ioule.. but it is necessary tp be careful in specifying what type of calorie or British thermal unit (Btu) is under consideration (there are four or five common kinds). For example, the type of calorie that is found in older tables of thermochemical properties of substances is the thermochemical calorie (equal to 4.184 J), whereas a second type of calorie is the International Steam Table (I.T.) calorie (equal to 4.1867 J). A kcal in nutrition is just called a calorie that is, a hamburger containing 500 calories really contains 500 kcal. 

The Fifth International Conference on the Properties of Steam (London, uly 1956) defined the International Table calorie as 4.1868 J. Therefore die exact conversion factor for die International Table Btu is 1.055 055 852 62 kJ. Note diat the notation for die International Table used in diis listing is subscript IT. Similarily, the notation for diermochemical is subscript di. Furdier, die diermochemical Btu, Btu j, is based on die diermochemical calorie, calu, where cal j = 4.184 J exactly. 

The calorie and Btu used in International Steam Tables, from 4.18680 J/cal (1ST). 

The calculation works equally well using values of and/or mass fractions rather than mole fractions, but commonly numbers are obtained from Steam Tables, which use the convention = 0, and joules or calories per... 

A small point to note in using Steam Tables as well as program steam is that these sources use the International Table calorie, which is defined as 4.1868 joules. Physical chemistry sources generally use the thermochemical calorie, which is 4.184 joules. This makes it difficult to be completely consistent when using calories for aqueous solutions, and is a good reason for using the SI system of units. 

This is the thermochemical calorie, used in most of physical chemistry. The International Table calorie used in Steam Tables is 4.1868 J (see page 388). 

Table of Conversion Factors Following the notation in Landolt-Bornstein [7], values which have been fixed by convention are indicated by a bold-face last digit. The conversion factor between calorie and Joule that is given here is based on the thermochemical calorie, calthch. and is defined as 4.1840 J/cal. However, for the conversion of the Internationale Tafelkalorie , caliT, into Joule, the factor 4.1868 J/cal is to be used [1, p. 147]. For the conversion factor for the British thermal unit, the Steam Table Btu, BTUst. is used [1, p. 95]. ... 

The thermochemical calorie is exactly 4.184 joules by definition. The international steam table (IT) calories is exactly 4.186 8 joules by definition. The thermochemical Btu is 1 054.350 joules. Each Btu is defined in terms of the corresponding calorie by 1 Btu/lbm R s 1 cal/g K. 

How much heat must be added to 1.0 kg of water at 25°C to convert it into steam at 300°C The CP of liquid may be taken as 1 cal/gK = 4.18 J/gK (this is the definition of the calorie.). The heat of vaporization may be obtained from Table 1 of Chapter 3 and gaseous heat capacity data from Table 1 of Chapter 2. 

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