University:
North Idaho College
Course:
PHYS-211 | Engineering Physics I
Academic year:

2023
Views:

280

Pages:

4
Author:

Hani T.

# PARACHOR from the Macleod equation which relates Surface Tension with Density we can write 1/4 1/4 D-d C = At Temperatures for below Tc, The Density of the liquid is much larger than that of the vapour. Thus, we can write D>d and replace D-d in the denominator by D , Multiplying by the Molecular weight of the liquid M. we get 1/4 1/4 MC = MI D = P where p is Constant defined as Parachor. M D is the molar Volume of the liquid at the Same Temperature at which Surface Tension is measured. If the Surface Tension γ were equal to 1, P the Prachor is the molar Volume of the liquid at a Temperature where y is unity. Since Molar volume is un is also additive Property, the parachor is also an additive Property. • Isomeric Compounds have the Same Value for p at a Particular Temperature • The Differences in p for a series of homologous compounds are Nearly the same. • It has been shown that p is both additive as well as Constitutive in that, I depends upon the number of atoms, besides depending upon Structural feature.