Laughing Gas (1914 film) Laughing Gas (1914 film) Laughing Gas is a 1914 film starring Charlie Chaplin. The film is also known as Busy Little Dentist, Down and Out, Laffing Gas, The Dentist, and Tuning His Ivories. We are told Charlie is a dental assistant. He arrives at work where the patients are already waiting. He joins the tiny second dental assistant in the back room. They have a brief squabble then Charlie goes to the waiting room to clean the floor with a carpet sweeper. He bumps into a patient and a further squabble starts. Then back to the rear room for more
Chemical substance and the International Chemical Identifier or InChI. Often a pure substance needs to be isolated from a mixture, for example from a natural source (where a sample often contains numerous chemical substances) or after a chemical reaction (which often give mixtures of chemical substances). Chemical substance A chemical substance is a form of matter having constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be simple substances, chemical compounds, or alloys. Chemical elements may or may not be included in the definition, depending on expert