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A fatty substance, now known as hair gel, was used to style hair and keep it in place. [1] The 1980s punk movement popularized using hair gel to sculpt spiky hairstyles, such as mohawks . [ 2 ] The ancient Gauls had invented a waxy soap-like substance, similar to hair wax, as a hair styling agent.
Spray-on hair was one of the products pioneered by Ronco in the 1980s, under the name "GLH-9" (Great Looking Hair Formula #9). [2] The product "was popular in the 1990s with 30-minute infomercials for the product on late-night cable TV", [ 3 ] and the Ronco version sold over a half million cans. [ 3 ]
Hair spray (also hair lacquer or spritz) is a common cosmetic hairstyling product that is sprayed onto hair to protect against humidity and wind and have it stay in a desired shape. Hair sprays typically consist of several components for the hair as well as a propellant.
A wide variety of spray nozzles exist, that make use of one or multiple liquid breakup mechanisms, which can be divided into three categories: liquid sheet breakup, jets and capillary waves. Spray nozzles are of great importance for many applications, where the spray nozzle is designed to have the right spray characteristics. [1]
The lowest-density silica nanofoam weighs 1,000 g/m 3, [59] which is the evacuated version of the record-aerogel of 1,900 g/m 3. [60] The density of air is 1,200 g/m 3 (at 20 °C and 1 atm). [61] The silica solidifies into three-dimensional, intertwined clusters that make up only 3% of the volume. Conduction through the solid is therefore very low.
[3] [4] When plant cells are in a hypertonic solution, the flexible cell membrane pulls away from the rigid cell wall , but remains joined to the cell wall at points called plasmodesmata . The cells often take on the appearance of a pincushion , and the plasmodesmata almost cease to function because they become constricted, a condition known as ...