The term is used in chemistry, biology, and agronomy. PH translates the values of the concentration of the hydrogen ion into numbers between 0 and 14.
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Danish biochemist S.P.L Sorensen used the measurement to represent the hydrogen ion concentration, expressed in equivalents per litre of an aqueous solution: pH = −log[H+]
The pH can be read with a less accurate litmus paper or with indicator dyes. However, it is usually measured with a pH meter that consists of a voltmeter attached to a pH-responsive electrode (usually mercury-mercurous chloride electrode) and a reference electrode (usually glass that are immersed in a solution. The voltmeter measures the potential difference between the glass and reference electrodes
In agriculture, the pH of the soil shows what crops will grow easily in the soil and what adjustments are needed to adapt it for growing other crops.
Acidic soils are often considered infertile as the solubility of aluminium and manganese also increase with acidity. However, conifers and members of the family Ericaceae, such as blueberries, prefer acidic soils. Acidic soil can be neutralized by treating it with lime.
Egyptian tombs excavated by modern archaeologists unearthed preserved pots of honey, which were thousands of years old, and yet unspoiled.
Pure honey, a hygroscopic food, remains preserved in a ready-to-eat form, and is medicinal in nature, unlike other resilient foods like dried rice or salt.
The planet’s ecosystem has many cycles, like the water cycle or the seasonal cycle, and one of the most important ones is the nutrient cycle. This is a biogeochemical cycle involving both living and nonliving components, describing the use, movement, and recycling of nutrients in the environment.
The various global and local cycles of nutrients involve valuable elements like oxygen, carbon, hydrogen, nitrogen and phosphorus.
Oxygen is atomic number 8 with the element symbol O. It was discovered by Carl Wilhelm Scheele in 1773, but he did not publish his work immediately, so credit is often given to Joseph Priestly in 1774.
Oxygen is one of the best-known gases on the planet, largely because it is so important for our physical survival. It is a crucial part of Earth's atmosphere and hydrosphere, it's used for medical purposes, and it has a profound effect on plants, animals, and metals.
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