Engineering is the use of scientific principles to design and build machines, structures, and other items, including bridges, tunnels, roads, vehicles, and buildings.

An engineering drawing is a type of technical drawing that is used to convey information about an object.

Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed.

Engineering tolerance is the permissible limit or limits of variation.

Enhanced geothermal systems (EGS) actively inject water into wells to be heated and pumped back out. The water is injected under high pressure to expand existing rock fissures to enable the water to freely flow in and out.

A process whereby oil is recovered other than by the natural pressure in a reservoir.

Enriched uranium is a type of uranium in which the percent composition of uranium-235 (written 235U) has been increased through the process of isotope separation.

The temperature of the water entering the heat pump from the ground loop heat exchanger.

Enthalpy is a property of a thermodynamic system, and is defined as the sum of the system's internal energy and the product of its pressure and volume.

The enthalpy of fusion of a substance, also known as (latent) heat of fusion is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.

The enthalpy of vaporization also known as the latent heat of vaporization or heat of evaporation, is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas.

A dry pulverized solid, an atomized liquid fuel or a fuel slurry is gasified with oxygen in co-current flow.

Entropy, the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work.

A custom form used for the clearance of ships or merchandise.

A measure of how fast we consume resources and generate waste compared to how fast nature can absorb our waste and generate new resources.

In environmental chemistry, the term "contamination" is in some cases virtually equivalent to pollution, where the main interest is the harm done on a large scale to humans, organisms, or environments.

A number of chemical substances react with oxygen or other gases. This reaction may affect the quality of the cargo or can generate a hazardous situation.

Environmental degradation is the deterioration of the environment through depletion of resources such as air, water and soil; the destruction of ecosystems; habitat destruction; the extinction of wildlife; and pollution.

A job type that is a professional engineering discipline investigates and creates solutions that will protect and also improve the health of living organisms and improve the quality of the environment.

An environmental factor, ecological factor or eco factor is any factor, abiotic or biotic, that influences living organisms.