It can be related to the contact angle in the Young-Lippmann equation, and the Marangoni effect is caused due to gradients in this quantity, which can also be measured with a Wilhelmy plate.
This quantity can be calculated using the Brock-Bird relation, while Sugden modified a different equation for it by defining a quantity called the parachor, which is proportional to this quantity to the one-fourth power.  Another method of calculating it is named after Sanchez, while the decrease of this quantity is governed by Traube's rule.  It can be related to the contact angle in the Young-Lippmann equation, and the Marangoni effect is caused due to gradients in this quantity, which can also be measured with a Wilhelmy plate. Taking into account intermolecular forces for molecules with no upper neighbors and made lower by surfactants, for 10 points, name this characteristic of a liquid that is responsible for capillary action.
This quantity can be calculated using the Brock-Bird relation, while Sugden modified a different equation for it by defining a quantity called the parachor, which is proportional to this quantity to the one-fourth power.  
{surface tension}