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Learn about the definition, measurement, and sources of total dissolved solids (TDS) in water. TDS is a measure of the dissolved content of inorganic and organic substances in water, and affects its quality, taste, and use.
Electrodialysis is a process that uses electric potential to transport salt ions from one solution to another through ion-exchange membranes. It is used for deionization, desalting, and concentration of aqueous solutions, and has advantages and disadvantages compared to other methods.
Learn the meaning and usage of various abbreviations in medical prescriptions, including Latin, Greek, and English terms. QD means "quaque die", meaning once daily, and is often used with a number to indicate the frequency of dosage.
Salinity is the saltiness or amount of salt dissolved in a body of water, usually measured in g/L or g/kg. Learn about different methods and scales of salinity measurement, and the major ions and other constituents that affect salinity.
Carbonic acid is a chemical compound with the chemical formula H2CO3. It rapidly converts to water and carbon dioxide in the presence of water, but is stable in the absence of water. Learn more about its structure, synthesis, and role in biochemistry and physiology.
This web page does not contain any information about naeon, a hypothetical element with the symbol N. It is a comprehensive list of medical abbreviations, acronyms, and initialisms, with definitions and examples.
The T-V diagram of the rubber band experiment. The decrease in the temperature of the rubber band in a spontaneous process at ambient temperature can be explained using the Helmholtz free energy = where dF is the change in free energy, dL is the change in length, τ is the tension, dT is the change in temperature and S is the entropy.
Learn about the synthesis, structure and applications of phenol formaldehyde resins, a group of synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde. Novolacs are phenol-formaldehyde resins with a formaldehyde to phenol molar ratio of less than one, and can be cured with a hardener.