The most common type of battery used today is the dry cell battery. There are many different types of batteries ranging from the relatively large flashlight batteries to the miniature versions used for wristwatches or calculators. Although they vary widely in composition and form, they all work on the sample principle. A dry-cell battery is essentially comprised of a metal electrode or graphite rod surrounded by a moist electrolyte paste enclosed in a metal cylinder. In the most common type of dry cell battery, the cathode is composed of a form of elemental carbon called graphite, which serves as a solid support for the reduction half-reaction. There are different types of dry cell batteries like alkaline battery, silver battery, mercury battery and nickel/cadmium battery.

Dry Chemical Extinguishers are filled with a fine yellow powder. Nitrogen is used to pressurize the extinguishers. This extinguisher put out fire by coating the fuel with a thin layer of dust, separating the fuel from the oxygen in the air. The powder also works to interrupt the chemical reaction of fire. This can be found in laboratories, mechanical rooms, break rooms, chemical storage areas, offices and university vehicles.

Dry chemical fire extinguishing agent is made up of pulverized sodium bicarbonate, which is completely silica-impregnated to make it free flowing, lump-free, and resistant to moisture absorption. This agent is effective in extinguishing initial combustion of oil tanks, in the rapid containment of flame expansion, and in extinguishing fires quickly. It is widely used in oilfields, oil depots, petroleum refineries, large chemical plants, chemical storerooms, ships, airport, mines, and factories.

Dry chemical powder is intended for use in extinguishing fires involving bulk chemical agents and liquefied gases. It is a fine amorphous mixture, which is used as a fire-extinguishing agent. The principal base chemicals used in the production of dry chemical extinguishing agents is sodium bicarbonate, potassium bicarbonate, potassium chloride, urea potassium bicarbonate, and monoammonium phosphate.

Dry Chemical Stored Pressure Extinguishers are coupled with rugged, dependable steel cylinders and stored pressure design. It contains a specially fluidized and siliconized mono ammonium phosphate chemical. It chemically insulates fires by melting at approximately 350 degrees F and coats the surface to which it is applied.

Dry-compression vacuum pumps have oil-free pump chambers. The advantage of the pumps is that they are capable of generating a vacuum, which is free of hydrocarbons.