Decomposition is the process by which dead organic substances are broken down into simpler organic or inorganic matter such as carbon dioxide, water, simple sugars and mineral salts.

The process of taking assets out of operation as they come to the end of their working life.

decision-making is regarded as the cognitive process resulting in the selection of a belief or a course of action among several possible alternative options, it could be either rational or irrational.

Decay heat is the heat released as a result of radioactive decay. This heat is produced as an effect of radiation on materials: the energy of the alpha, beta or gamma radiation is converted into the thermal movement of atoms.

The decay energy is the energy released by a radioactive decay.

In a solid, constituent particles are closely packed together.

A solenoid voltmeter is a specific type of voltmeter electricians use to test electrical power circuits.

A solenoid valve is an electromechanically-operated valve.

A solenoid bolt is a type of electronic-mechanical locking mechanism.

A solenoid is a type of electromagnet, the purpose of which is to generate a controlled magnetic field through a coil wound into a tightly packed helix.

Solar-powered pumps run on electricity generated by photovoltaic panels or the radiated thermal energy available from collected sunlight as opposed to grid electricity- or diesel-run water pumps.

Photovoltaic windows convert sunlight to electricity for the building. In most cases, translucent photovoltaic cells are used.

Solar water heating is heating water by sunlight, using a solar thermal collector.

The solar updraft tower is a design concept for a renewable-energy power plant for generating electricity from low temperature solar heat.

A solar tracking system tilts a solar panel throughout the day.

A solar tracker is a device that orients a payload toward the Sun.

Solar thermal technologies concentrate solar radiation on to a receiver, where it is converted into heat, which can then boil a liquid to produce steam to drive turbines.

A system that harnesses the thermal power of the sun to generate electricity.

A solar thermal collector collects heat by absorbing sunlight.

Solar shingles, also called photovoltaic shingles, are solar panels designed to look like and function as conventional roofing materials, such as asphalt shingle or slate, while also producing electricity.