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  2. Water supply and sanitation in Bangladesh - Wikipedia

    en.wikipedia.org/wiki/Water_supply_and...

    The standard for total dissolved solids (TDS) is 1000 mg/L but desalination delivers water with as low as 40 mg/L TDS unless it is fortified with essential minerals after treatment. Drinking water should contain minimum levels of calcium and magnesium, for example. Professional water service providers for schools

  3. List of Indian states and union territories by access to safe ...

    en.wikipedia.org/wiki/List_of_Indian_states_and...

    Kerala ranked highest with 97.6%, while Andhra has the worst rank with only 33.5% households having access to safe drinking water. National average stands at 85.5%. Rank. State. Percentage of households with access to safe drinking water (2011) 1. Kerala. 97.6. 2.

  4. Atmospheric pressure - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_pressure

    The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa ), which is equivalent to 1,013.25 millibars, [1] 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. [2] The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth; that is, the Earth's atmospheric pressure at sea level is ...

  5. Terahertz time-domain spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Terahertz_time-domain...

    In physics, terahertz time-domain spectroscopy ( THz-TDS) is a spectroscopic technique in which the properties of matter are probed with short pulses of terahertz radiation. The generation and detection scheme is sensitive to the sample's effect on both the amplitude and the phase of the terahertz radiation. Fourier transform of the above pulse.

  6. Freshwater environmental quality parameters - Wikipedia

    en.wikipedia.org/wiki/Freshwater_environmental...

    Ecology portal. v. t. e. Freshwater environmental quality parameters are those chemical, physical or biological parameters that can be used to characterise a freshwater body. Because almost all water bodies are dynamic in their composition, the relevant quality parameters are typically expressed as a range of expected concentrations.

  7. Reference water levels - Wikipedia

    en.wikipedia.org/wiki/Reference_water_levels

    The reference water levels are used on inland waterways to define a range of water levels allowing the full use of the waterway for navigation. Ship passage can be limited by the water levels that are too low, when the fairway might become too shallow for large ("target", "design") ships, or too high, when it might become impossible for the target ships to pass under the bridges.

  8. Salinometer - Wikipedia

    en.wikipedia.org/wiki/Salinometer

    A salinometer. A salinometer is a device designed to measure the salinity, or dissolved salt content, of a solution . Since the salinity affects both the electrical conductivity and the specific gravity of a solution, a salinometer often consist of an ec meter or hydrometer and some means of converting those readings to a salinity reading.

  9. Wastewater quality indicators - Wikipedia

    en.wikipedia.org/wiki/Wastewater_quality_indicators

    Wastewater quality indicators are laboratory test methodologies to assess suitability of wastewater for disposal, treatment or reuse. The main parameters in sewage that are measured to assess the sewage strength or quality as well as treatment options include: solids, indicators of organic matter, nitrogen, phosphorus, indicators of fecal ...

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