Radiative forcing is the difference between solar irradiance (sunlight) absorbed by the Earth and energy radiated back to space.

Radiative cooling is the process by which a body loses heat by thermal radiation.

n the United States, the person within an organization responsible for the safe use of radiation and radioactive materials as well as regulatory compliance.

Radiation protection, also known as radiological protection, is defined by the International Atomic Energy Agency (IAEA) as "The protection of people from harmful effects of exposure to ionizing radiation, and the means for achieving this".

Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation.

A category of HVAC technologies that exchange heat by both convection and radiation with the environments they are designed to heat.

In radiometry, radiant flux or radiant power is the radiant energy emitted, reflected, transmitted or received, per unit time.

In radiometry, radiant exposure or fluence is the radiant energy received by a surface per unit area.

In physics radiant energy is the energy of electromagnetic and gravitational radiation, its SI unit is the joule (J). Most commonly used in the fields of radiometry, solar energy, heating and lighting

A category of HVAC technologies that exchange heat by both convection and radiation with the environments they are designed to cool.

Hydro-Québec's electricity transmission system (also known as the Quebec interconnection) is an international power transmission system centred in Quebec, Canada.

A radial turbine is a turbine in which the flow of the working fluid is radial to the shaft.

A quantum dot solar cell is a solar cell design that uses quantum dots as the absorbing photovoltaic material.

A quality management system (QMS) is a set of policies, processes and procedures required for planning and execution of a company's core business that can impact the companies ability to meet customer requirements.

Quantity is a property that can exist as a multitude or magnitude, which illustrate discontinuity and continuity.

Quality control (QC) is a process by which entities review the quality of all factors involved in production.

A quad is a unit of energy used by the U.S.

QBlade is an open-source, cross-platform simulation software for wind turbine blade design and aerodynamic simulation.

Wind hybrid power systems combines wind turbines with other storage and/or generation sources.

The wind lens is a modification on the wind turbine created by Professor Ohya from the Kyushu University as an attempt to be more efficient in production of electricity and less invasive to both humans and nature.