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Sugden defined in 1924 parachor as (surface tension in mN/m)^(1/4).(molar volume in cm^3/mol). This definition is used up to now and it results in usual parachor values of the order of magnitude of 100. Therefore, parachor is a derived quantity like any other and its unit is (mN/m)^(1/4).cm^3/mol. This unit is so bizare in the light of usual experience that most authors do not dare give it in their texts and prefer not to give any unit. Owing to this fact, there has arisen the mistaken impression that the parachor has no unit.
S. Sugden, J. Chem. Soc. Trans. 125 (1924) 1167--1177, from contemporary literature see
M. Souckova et al. J. Chem. Thermodynamics 83 (2015) 52-60
Wiki User
∙ 9y ago
Wiki User
∙ 11y agoparachor has no unit because its formula values cancelled out with each other.
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What is parachore and its effect in chemistry?
Parachor is a quantity relating the surface tension to the molecular weight and density. It is defined by the formula (surface tension ^1/4) * M / d. Parachor is used in solving structural problems. Sugden defined in 1924 parachor as (surface tension in mN/m)^(1/4).(molar volume in cm^3/mol). This definition is used up to now and it results in usual parachor values of the order of magnitude of 100. Therefore, parachor is a derived quantity like any other and its unit is (mN/m)^(1/4).cm^3/mol. This unit is so bizare in the light of usual experience that most authors do not dare give it in their texts and prefer not to give any unit. Owing to this fact, there has arisen the mistaken impression that the parachor has no unit. S. Sugden, J. Chem. Soc. Trans. 125 (1924) 1167--1177, from contemporary literature see M. Souckova et al. J. Chem. Thermodynamics 83 (2015) 52-60
What is parachor and its uses?
Sugden defined in 1924 parachor as P=(surface tension in mN/m)^(1/4).(molar mass in g/mol).(density in g/cm^3), which is equivalent to (surface tension in mN/m)^(1/4).(molar volume in cm^3/mol). This definition is used up to now and it results in usual parachor values of the order of magnitude of 100. Therefore, parachor is a derived quantity like any other and its unit is (mN/m)^(1/4).cm^3/mol. This unit is so bizare in the light of usual experience that most authors do not dare give it in their texts and prefer not to give any unit. Owing to this fact, there has arisen the mistaken impression that the parachor has no unit. Sugden showed empirically that P is additive with respect to the composition of molecules of compounds from different atoms and atomic groups. As a result, when the values of the contributions to parachor from the individual atomic groups of molecules are known the surface tension of substances can be evaluated from their molecular structure. S. Sugden, J. Chem. Soc. Trans. 125 (1924) 1167--1177, from contemporary literature see M. Souckova et al. J. Chem. Thermodynamics 83 (2015) 52-60
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183.90 Myself calculated in Lab.
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anigaa leh duli
Difference between parachor and rheochor?
parachor is depend on the surface tention of the liquid and its molar volume rheocor is depend upoun the viscosity of a liquid . both are additive and constiitutive property.
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The formula of parachor is: P = γ1/4 M / dFor benzene at 20 oC: P =206,6
Basic concept of parachor and rheochor?
[p]=M/D*(surface tension)1/4 is called parachord [R]=M/D*(viscosity)1/8 is call rehochor
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Sugden's parachor contribution values for molecular compounds were subsequently improved by Mumford and Phillips (1929), Quayle (1953) and Knotts et al. (2001) S.A. Mumford, J.W.C. Phillips, J. Chem. Soc. (1929) 2112-2133. O.R. Quayle, Chem. Rev. 53 (1953) 439-489. T.A. Knotts, W.V. Wilding, J.L. Oscarson, R.L. Rowley, J. Chem. Eng. Data 46 (2001) 1007-1012.
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Sugden's parachor contribution values for molecular compounds were subsequently improved by Mumford and Phillips (1929), Quayle (1953) and Knotts et al. (2001) S.A. Mumford, J.W.C. Phillips, J. Chem. Soc. (1929) 2112-2133. O.R. Quayle, Chem. Rev. 53 (1953) 439-489. T.A. Knotts, W.V. Wilding, J.L. Oscarson, R.L. Rowley, J. Chem. Eng. Data 46 (2001) 1007-1012.
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