The word emulsion comes from the Latin mulgeo, mulgere to milk, [specify] as milk is an emulsion of fat and water, along with other components. Two liquids can form different types of emulsions. As an example, oil and water can form, first, an oil-in-water emulsion, wherein the oil is the dispersed phase, and water is the dispersion medium.
Historians consider the first touch screen to be a capacitive touch screen invented by E.A. Johnson at the Royal Radar Establishment, Malvern, UK, around 1965 - 1967. The inventor published a full description of touch screen technology for air traffic control in an article published in 1968.
Tailor your design to the type of interaction used on touch-screen devices. In general, touch-screen applications are accessed using the fingers in direct contact with the screen rather than with the mouse, keyboard and monitor used for typical Web and desktop software applications. Your design, therefore, must be usable when only fingers are used to interact with it.