Environment Database
The environment database and a glossary about facts, terms and descriptions

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Glossary H

The Environmental Glossary. Letter H +++ Popular Articles: 'Hierarchical grid', 'Habitat fragmentation', 'Heating Penalty'

Health risks

Deutsch: Gesundheitsrisiken / Español: Riesgos para la Salud / Português: Riscos para a Saúde / Français: Risques pour la Santé / Italiano: Rischi per la Salute

Health risks in the environment context refer to potential threats to human health that arise from exposure to environmental hazards. These risks can be associated with various factors such as air and water pollution, chemical exposure, climate change, radiation, and biological contaminants. Environmental health risks can lead to a range of health issues, from respiratory and cardiovascular diseases to cancer and infectious diseases.

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Hearings

hearings are testimony (sworn statements like those given in court) given before a Congressional committee.

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Heat

Deutsch: Hitze / Español: Calor / Português: Calor / Français: Chaleur / Italiano: Calore /

A Heat is Refers to the Estrous period for a female of breeding age. In swine, the first Estrous normally occurs 3 to 5 days after the pigs are weaned.

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Heat content

A Heat content is the amount of Heat per unit mass released upon complete combustion.

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Heat Efficiency

Deutsch: Wärmewirkungsgrad / Español: Eficiencia térmica / Português: Eficiência térmica / Français: Rendement thermique / Italiano: Efficienza termica

Heat Efficiency refers to the ratio of useful energy output to the total energy input in a thermal process, quantifying how effectively a system converts heat into work or another desired form of energy. It is a critical metric in environmental engineering, energy management, and industrial applications, where optimizing thermal performance directly impacts sustainability, cost, and resource conservation.

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Heat Exhaustion

Heat exhaustion is a phenomenon caused by fluid loss, which in turn causes decreased blood flow to vital organs.

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Heat Island Effect

A Heat Island Effect is This phenomenon describes urban and suburban temperatures that are 2_ to 10_F (1_ to 6_C) warmer than nearby rural areas.

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Heat Pipe

A Heat Pipe is a device that can quickly transfer heat from one point to another.

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Heat Recovery System

A Heat Recovery System is This system saves energy depending on the season and only operates for sensible Heat recovery.

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Heat Stroke:

A Heat Stroke: is Heat stroke occurs when the body's Heat regulating mechanisms - including convection, sweating, and Respiration - fail. The likelihood of Heat stroke increases when

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