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GlossaryViscosity

measure of fluid's resistance to flow

Viscosity is a measure of a fluid's resistance to flow. Imagine trying to pour honey versus water; honey flows much more slowly because it has higher viscosity. For professionals, viscosity is crucial in understanding how substances like shampoos or conditioners will behave when applied to hair, affecting their spreadability and effectiveness.

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research Effects of Silicone Oil Viscosity on the Physical Structure and Damage Mechanisms of Hair during Permanent Wave Treatment

February 2026 in “Journal of the Korean Society of Cosmetology”

Silicone oil viscosity affects hair curling and damage during treatments.

research Pharmaceutical evaluation of different shampoo brands in local Saudi market

37 citations , October 2017 in “Saudi pharmaceutical journal”

All evaluated shampoos meet Saudi standards.

research Factors influencing hydrocortisone permeation into human hair follicles: Use of the skin sandwich system

16 citations , March 2008 in “International journal of pharmaceutics”

Different factors like pH, gel type, and chemical enhancers affect how well hydrocortisone gets into hair follicles, and less hydrated skin doesn't work well with the test method.