såpeskum
Såpeskum, meaning "soap foam" in Norwegian, refers to the frothy substance that forms when soap or detergent is mixed with water and agitated. This foaming action is a result of surfactants present in the soap. Surfactants are molecules with both hydrophilic (water-attracting) and hydrophobic (water-repelling) ends. When introduced to water, they arrange themselves at the water's surface, reducing its surface tension. This reduction in surface tension allows air to be incorporated, creating bubbles and thus the foam.
The presence of såpeskum is often an indicator of effective cleaning. The foam can help lift dirt