Human machine interfaces vary widely, from control panels for nuclear power plants to the screen and input buttons on a cell phone. Designing such interfaces is a challenge, and requires a great deal of work to make the interface functional, accessible, pleasant to use, and logical.ome engineers specialize in developing human machine interfaces and changing the ways in which people interact with machines and systems. Two components are needed in a human machine interface. The first is an input.
ASSORTED REACTIONS OF BENZENE AND METHYLBENZENE This page gives details of some reactions of benzene and methylbenzene (toluene) not covered elsewhere in this section.It deals with the combustion, hydrogenation and sulphonation of benzene and methylbenzene (toluene), and with the oxidation of side chains attached to benzene rings.Remember that benzene, methylbenzene and similar hydrocarbons based on benzene rings are collectively known as arenes.Combustion.SSORTED REACTIONS OF BENZENE AND METHYLBENZENE This page gives details of some reactions of benzene and methylbenzene (toluene) not covered elsewhere in this section.
Addition reactions In the presence of ultraviolet light (but without a catalyst present), hot benzene will also undergo an addition reaction with chlorine or bromine. The ring delocalisation is permanently broken and a chlorine or bromine atom adds on to each carbon atom.ubstitution into the methyl group If chlorine or bromine react with boiling methylbenzene in the absence of a catalyst but in the presence of UV light, substitution happens in the methyl group rather than the ring. For example, with chlorine (bromine would be similar): The organic product is (chloromethyl)benzene.