Glossary A
Deutsch: Saurer Regen / Español: Lluvia Ácida / Português: Chuva Ácida / Français: Pluie Acide / Italiano: Pioggia Acida /
Acid rain is the result of sulfur dioxide (SO2) and nitrogen oxides (NOx) reacting in the atmosphere with water and returning to earth as rain, fog, or snow. Broadly used to include both wet and dry deposition. The acid rain page provides a great deal of information about this issue.
Acidity may be defined as the quality, state or degree of being acid ; or the level of acid in a substance.
Acidity is measured in pH, or the negative log of the activity of the hydrogen ion in an aqueous solution. Solutions with a pH less than 7 are said to be acidic. The pH of an aqueous substance can be measured using a glass electrode and a pH meter, or with the use of pH indicators .
Or a more chemical definition: Acidity is a measure of the number of free hydrogen ions (H+) in a solution that can chemically react with other substances.
Deutsch: Akustische Kontrolle / Español: Control Acústico / Português: Controle Acústico / Français: Contrôle Acoustique / Italiano: Controllo Acustico
Acoustic Control refers to the systematic management and manipulation of sound waves within an environment to achieve desired acoustic conditions. This discipline combines principles of physics, engineering, and environmental science to mitigate noise pollution, enhance sound quality, or optimize auditory experiences in various settings. Whether applied in urban planning, industrial facilities, or architectural design, acoustic control plays a critical role in balancing human well-being with technological and infrastructural demands.
Deutsch: Akustische Probleme / Español: Problemas acústicos / Português: Problemas acústicos / Français: Problèmes acoustiques / Italiano: Problemi acustici
Acoustic issues refer to disturbances or adverse effects caused by sound waves in a given environment, which can impair human well-being, communication, or the functionality of technical systems. These issues arise when sound levels, frequencies, or durations exceed acceptable thresholds, leading to noise pollution, structural vibrations, or interference with sensitive equipment. Addressing acoustic challenges requires a multidisciplinary approach, combining physics, engineering, and environmental science to mitigate negative impacts.