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 and grease from surfaces, making them easier to wash away. In applications like handwashing, dishwashing, and laundry, såpeskum is a familiar visual cue that the cleaning process is underway. The stability and volume of the foam can vary depending on the type of soap or detergent used, the temperature of the water, and the amount of agitation. Some cleaning products are formulated to produce abundant foam, while others are designed for low-foaming properties, which can be advantageous in certain washing machines or for specific cleaning tasks where excessive suds might be problematic. In some contexts, såpeskum can also refer to a specific type of artistic or decorative foam created using soap solutions.