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  2. pH meter - Wikipedia

    en.wikipedia.org/wiki/PH_meter

    A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2]

  3. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    Therefore, pH values on the different scales cannot be compared directly because of differences in the solvated proton ions, such as lyonium ions, which require an insolvent scale that involves the transfer activity coefficient of hydronium/lyonium ion. pH is an example of an acidity function, but others can be defined.

  4. Low Elevation Coastal Zone - Wikipedia

    en.wikipedia.org/wiki/Low_Elevation_Coastal_Zone

    The Low Elevation Coastal Zone (LECZ) refers to low-lying coastal areas with an elevation below a certain threshold, commonly 10 meters, above mean sea level.Globally, there is a substantial and growing population living in the Low Elevation Coastal Zone, which consists of approximately 2% of the world's land area and around 11% of the global population.

  5. Geography of the Philippines - Wikipedia

    en.wikipedia.org/wiki/Geography_of_the_Philippines

    Whether in the extreme north, south, east, or west of the country, temperatures at sea level tend to be in the same range. Altitude usually has more of an impact. The average annual temperature of Baguio at an elevation of 1,500 meters (4,900 ft) above sea level is 18.3 °C (64.9 °F), making it a popular destination during hot summers. [52]

  6. Soda lake - Wikipedia

    en.wikipedia.org/wiki/Soda_lake

    Lake Shala, in the East African Rift Valley. A soda lake or alkaline lake is a lake on the strongly alkaline side of neutrality, typically with a pH value between 9 and 12. They are characterized by high concentrations of carbonate salts, typically sodium carbonate (and related salt complexes), giving rise to their alkalinity.

  7. Glass electrode - Wikipedia

    en.wikipedia.org/wiki/Glass_electrode

    H + does not cross through the glass membrane of the pH electrode, it is the Na + which crosses and leads to a change in free energy. When an ion diffuses from a region of activity to another region of activity, there is a free energy change and this is what the pH meter actually measures.

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  9. Glossary of geography terms (A–M) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geography_terms...

    This glossary of geography terms is a list of definitions of terms and concepts used in geography and related fields, including Earth science, oceanography, cartography, and human geography, as well as those describing spatial dimension, topographical features, natural resources, and the collection, analysis, and visualization of geographic ...

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