Dosing and Metering

Dosing generally applies to feeding chemicals or medicines in small quantities into a process fluid or to a living being at intervals or to atmosphere at intervals to give sufficient time for the chemical or medicine to react or show the results. This word dosing as per the dictionary is the verb format for the word dose which is a noun.

In the case of human beings or animals (i.e. living beings) the word dose is generally used but in the case of inanimate objects the word dosing is being used. This is only in practice.

In engineering

The word dosing is very commonly used by engineers in Thermal power stations or in any industry where steam is being generated. Dosing procedures are also in vogue in textile and similar industries where chemical treatment is invloved. In a power station treatment chemicals are injected or fed to boiler and also to feed and make up water under pressure, but in small dosages or rate of injection. The feeding at all places is done by means of small capacity dosing pumps specially designed for the duty demanded.

In agriculture

The feeding of chemicals in agriculture has also become common due to technology developments in this field. However the dosing in the agricultural field is done by means of hand held pressure spray pumps or similar devices.

Aerial spraying

Some times aerial spraying of chemicals by fixed quantities at intervals or dosing is also adopted for agricultural spraying or for atmospheric spraying for eliminating certain types of harmful insects.

See also

• Dose

Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea

In physics and engineering, measurement is the activity of comparing physical quantities of real-world objects and events. Established standard objects and events are used as units, and the measurement results in a given number for the relationship between the item under study and the referenced unit of measurement. Measuring instruments are the means by which this translation is made. All measuring instruments are subject to varying degrees of instrument error.

Physicists use a vast range of instruments to perform their measurements. These range from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators.

• Mass
  • balance
  • weighing scales
  • mass spectrometer
  • katharometer

History of Weights and Measures

• Time
  • calendar
  • chronometer
  • clock
  • atomic clock
  • radiometric dating

Timeline of time measurement technology

• Length (i.e., distance)
  • altimeter (measures height)
  • architect's scale
  • engineer's scale
  • interferometer
  • micrometer
  • odometer
  • opisometer
  • ruler
  • tape measure
  • laser rangefinder
  • ultrasound distance measure
  • GPS
  • Electronic distance meter

• Area
  • planimeter

• Angles
  • sextant
  • theodolite
  • protractor

• Temperature
  • thermometer
  • thermocouples
  • thermistors
  • pyrometers
  • electromagnetic spectroscopy

• Humidity
  • hygrometer

• Pressure
  • barometer
  • manometer
  • Pitot tube (used to determine speed)
  • anemometer (used to determine wind speed)
  • tire-pressure gauge

• Flow

• pH

• Level
  • spirit level
  • laser line level
  • Dumpy level

• Radiation
  • geiger counter
  • Nichols radiometer

• Sound

• Light
  • Photometer
  • Spectrometer

• Speed
  • speedometer
  • airspeed indicator

• Electrical properties
  • electrometer (measures charge)
  • ammeter (measures electrical current)
  • galvanometer (measures current)
  • ohmmeter (measures resistance)
  • voltmeter (measures voltage)
  • Wheatstone bridge
  • multimeter (measures all of the above)
  • oscilloscope
  • watt meter (measures power)
  • electric energy meter (measures energy)

• Hardness
  • durometer

• Uncategorized
  • colorimeter (measures absorbance, and thus concentration)
  • radiometry
  • sicroscope
  • spectroscopy is an important tool used by physicists.

See also

Timeline of temperature and pressure measurement technology