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Osmotic power – or salinity gradient power – is the energy available from the difference in the salt concentration between seawater and river water. OTEC – ocean thermal energy conversion; Oxidation; Peat; Penrose Mechanism; Petroleum; Photovoltaics; Piezoelectricity; Pneumatics – compressed air; Products based on refined oil; Propellant
These expressions are often used to describe the total energy supply of a national territory. Secondary energy is a carrier of energy, such as electricity. These are produced by conversion from a primary energy source. Primary energy is used as a measure in energy statistics in the compilation of energy balances, [5] as well as in the field of ...
Oceans often act as renewable resources. Sawmill near Fügen, Zillertal, Austria Global vegetation. A renewable resource (also known as a flow resource [note 1] [1]) is a natural resource which will replenish to replace the portion depleted by usage and consumption, either through natural reproduction or other recurring processes in a finite amount of time in a human time scale.
Gross primary production (GPP) is the amount of chemical energy, typically expressed as carbon biomass, that primary producers create in a given length of time. Some fraction of this fixed energy is used by primary producers for cellular respiration and maintenance of existing tissues (i.e., "growth respiration" and " maintenance respiration ").
Net primary production measures the organic molecules by primary producers. Net primary production also measures the amount of carbon assimilated into organic molecules by primary producers, but does not include organic molecules that are then broken down again by these organism for biological processes such as cellular respiration . [ 5 ]
Primary (chemistry), term used in organic chemistry; Primary, the oldest period in the Geologic time scale (obsolete), combining the Precambrian and Paleozoic; Primary, a stage in a thermonuclear explosive; Primary circuit, electrical circuit in a transformer that receives current, as opposed to secondary circuit
As Americans grapple with a health care system that costs $10,000 per person annually, a form of health care that avoids the insurance system is starting to become an alternative option.
A primary function of land change science is to document and model long-term patterns of landscape change, which may result from both human activity and natural processes. [23] In the course of monitoring and assessing land cover and land use changes, scientists look at several factors, including where land-cover and land-use are changing, the ...