A hygrometer is an instrument that can range from something that is really basic in design, such as a psychrometer or the hair hygrometer, on up to more detailed instruments, like a cooled mirror dew point hygrometer, which actually measures humidity using the condensation temperature. There are also more modern devices which track humidity from differences in both the electrical capacity and electrical resistance. If you are asking “what is a hygrometer?”, then you probably don’t work in an industrial, outdoor or military capacity, as these industries rely on them for their job. Hygrometers aren’t just used in industrial areas, greenhouses and other larger spaces, however, as they are also used in a variety of situations where controlling humidity is needed. For example, hygrometers are extremely helpful to those who work with surface coatings for industrial buildings, as these coatings are often very sensitive to changes in humidity and dew point and require careful monitoring of conditions in order to set correctly. A hygrometer makes these types of jobs much easier
Anemometer is an apparatus for measuring the speed of wind. The commonest kind of anemometer is a kind of horizontal three-armed windmill, with a hollow hemispherical cup on the end of each arm. (See photo.) The pressure on the inside of a cup when it is back to wind overcomes the pressure on the rounded front of the cup on the opposite arm, and the cups revolve at rather more than two-fifths the speed of the wind. The mill moves a pointer round a graduated dial. By timing a given number of revolutions, as shown by the pointer, the speed of the wind is easily calculated. v : Air Velocity (m/s)
The flash point temperature of diesel fuel is the minimum temperature at which the fuel will ignite (flash) on application of an ignition source under specified conditions. Flash point varies inversely with the fuel’s volatility. Flash point minimum temperatures are required for proper safety and handling of diesel fuel. Due to its higher flash point temperature, diesel fuel is inherently safer than many other fuels, such as gasoline.The flash point of diesel fuel varies from 126 t0 205 degree fahrenheit(52 to 96 degree celsius )depending upon the type of diesel fuel.The fire point of a fuel is the temperature at which the vapour produced by that given fuel will continue to burn for at least 5 seconds after ignition by an open flame. At the flash point, a lower temperature, a substance will ignite briefly, but vapor might not be produced at a rate to sustain the fire.Fire point can be assumed to be 10 degree celsius higher than flash point.
Sulfur and its compounds are present in virtually all petroleum products and lubricants — from crude oils to the ultra-low sulfur fuels of the future. The sulfur levels in these products vary from the highest amounts in the crude oils and some lubricants to trace levels in the currently proposed road fuels. Sulfur oxides formed during the combustion of gasolines or diesel fuels in internal combustion engines are undesirable because of the damage they do to the engine and to the environment. Acids of sulfur oxides increase rusting and corrosion of engine parts, piston rings, and cylinder walls. In the atmosphere, sulfur oxides convert to sulfuric acid by reaction with moisture, and harm vegetation, aquatic, animal and human life. They also corrode man-made buildings and monuments.
which are used to measure solar radiation flux density (W/m2), or devices used to measure the kWh production from a PV system. This article is about the latter.
A barometer is a widely used weather instrument that measures atmospheric pressure (also known as air pressure or barometric pressure) -- the weight of the air in the atmosphere
Fuel cell vehicles use hydrogen gas to power an electric motor. Unlike conventional vehicles which run on gasoline or diesel, fuel cell cars and trucks combine hydrogen and oxygen to produce electricity, which runs a motor. Since they’re powered entirely by electricity, fuel cell vehicles are considered electric vehicles (“EVs”) but unlike other EVs, their range and refueling processes are comparable to conventional cars and trucks. Converting hydrogen gas into electricity produces only water and heat as a byproduct, meaning fuel cell vehicles don’t create tailpipe pollution when they’re driven. Producing the hydrogen itself can lead to pollution, including greenhouse gas emissions, but even when the fuel comes from one of the dirtiest sources of hydrogen, natural gas, today’s early fuel cell cars and trucks can cut emissions by over 30 percent when compared with their gasoline-powered counterparts. Future renewable fuel standards
ORP, or Redox Potential, is a measurement of water’s ability to oxidize contaminants. The higher the ORP, the greater the number of oxidizing agents. Checking ORP is a simple method to monitor the effectiveness of a sanitizer or the quantity of anti-oxidants in a liquid. In generalized terms for humans, a higher ORP is better for outside of the body, while a lower ORP is preferred for consumption due to the high anti-oxidant value.