One of the oldest types of Hygrometer includes hair tension type. It uses the length of a human or animal hair as the humidity sensor. Since the change of the hair length with humidity is very small to detect, a magnifying mechanism is used to read the length easily.
Dry and wet bulb Hygrometers are reliable and widely used. It comes with a chart to find relative humidity using the temperature difference between thermometers.
Nowadays, electronic humidity sensors are also available. Humidity measurement plays a huge role when humidity level restrictions are specified for some sensitive electronic devices and pharmaceuticals.
Humidity measurements are very important in forecasting weather. A hydrometer is used to measure the density of a liquid. Precisely, it measures the specific gravity , in other words, the relative density of a liquid. Sometimes, solute content is extracted by the density of the solution. A typical Hydrometer has 2 major parts; cylindrical stem and weighted bulb.
It has a scale on the stem which allows to read specific gravity or some other measurement easily. Hydrometers should be handled carefully since most of them are made of glass.
The theory behind Hydrometer comes from the Archimedes age. An object which is buoyed partly or fully in a fluid experiences a force equal to the weight of the fluid displaced by the submerged part of the object.
There is no need to resubmit your comment. Notify me of followup comments via e-mail. Written by : Prishani Reddy. User assumes all risk of use, damage, or injury. You agree that we have no liability for any damages. History The first hydrometers are said to have been invented in the early 5 th century, by a Greek scholar named Hypatia. Urinometer: used in medical science to conduct a urine analysis Barkometer: measures the strength of tanning liquors Battery hydrometer: used to measure the charge of the battery Antifreeze tester: measures the quality of antifreeze solution used in cooling engines Acidometer: measures the specific gravity of an acid Salinometer: measures salt content in water solution Hygrometer The great Leonardo da Vinci invented the first hygrometer in the 15 th century.
The many different types of hygrometers now include: Metal-paper coil hygrometers: water vapour is absorbed by a paper strip indicating moisture on a dial Psychrometer: consists of both a wet and dry bulb, where the wet bulb is connected to the water tank Chilled mirror dew point hygrometer: these instruments are more precise and are used to detect condensation on the surface of a mirror Capacitative hygrometers: these are suitable for various applications Resistive hygrometers: measures the changes in electrical resistance due to humidity Thermal hygrometers: measures the change in thermal conductivity due to humidity Gravimetric: this is the most accurate of hygrometers, testing humidity levels [ii].
Ranges and Scales Hydrometers generally utilise the following scales: Baume Brix Plato While, most basic hygrometers use a graduated scale. Uses Hydrometers can be used in the following contexts: Used in soil analysis Winemaking and brewing Tests the quality of milk Used in sugar content analysis Used for measurement of density in petroleum products Measures electrolyte temperature and specific gravity as part of a battery test Used to conduct urine analysis Whereas, Hygrometers are used in various contexts namely Incubators Industrial spaces Greenhouses Saunas Humidors Museums To care for wood musical instruments such as guitars, harps, pianos, etc.
Residential uses to monitor humidity levels Coating industry e. Author Recent Posts. Prishani Reddy.
Latest posts by Prishani Reddy see all. Help us improve. Rate this post! Cancel Reply. References : [0][i] Hydrometers: Introduction, Function and Use.
Follow Us. Factors such as cleanliness, temperature, and proper immersion need to be accounted for to maintain accuracy. Harlon currently works as a quality moderator and content writer for Difference Wiki. He graduated from the University of California in with a degree in Computer Science.
Follow him on Twitter HarlonMoss. Harlon Moss. April 25, Harlon Moss Harlon currently works as a quality moderator and content writer for Difference Wiki. Previous Post. Next Post. A device that calculates the density or specific gravity of a liquid by moving in the liquid is known as a hydrometer. A device that measures the humidity, the amount of water vapor exist in the air, is known as a hygrometer.
Most of the time, the working principle works through measuring how much an object sinks in a liquid. There are many different types, and each work on the specific law and each type makes use of an altered principle to measure the humidity in the atmosphere. Some factors such as temperature, cleanliness, and proper immersion need to be accounted to maintain the accuracy.
Some factors for example pressure, temperature, mass, and electrical charge are required to standardize to ensure the accuracy.
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