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What is the instrument with two thermometers one with a wet bulb and one with a dry bulb?
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What is Psychometer?
An instrument that uses the difference in readings between two thermometers, one having a wet bulb and the other having a dry bulb, to measure the moisture content or relative humidity of air.
What is a hygrometers?
AnswerA hygrometer is an instrument for measuring humidity in the surrounding environment.using to bulb thermometers in it one is dry and the other one is wet.the wet one is used to know the amount of humidity due to evaporation and then it's compared with the reading of the dry one to get the difference.which is the rate of humidity.A hygrometer measures humidity in the surrounding environment.using to bulb thermometers in it one is dry and the other one is wet.the wet one is used to know the amount of humidity due to evaporation and then it's compared with the reading of the dry one to get the difference.which is the rate of humidity.
What does a psychrometer use?
A psychrometer uses two thermometers to measure both the dry and wet bulb temperatures of the air. By comparing these two temperatures, the psychrometer can calculate the relative humidity of the air.
What is a Psychrometer's?
A psychrometer is a simple form of hygrometer, an instrument which measures relative humidity. The psychrometer compares the dry-bulb and wet-bulb air temperatures.The "whirling psychrometer" is an instrument for the measurement of the temperature and humidity of the air. It contains two Mercury-in-glass thermometers with a scale of minus 5 to plus 50 degrees Celsius, in 0.5 degree increments. One is an ordinary dry bulb thermometer and the other wet bulb thermometer whose bulb is surrounded by a piece of thin muslin, kept moist with distilled water.
How a hygrometer work?
Any instrument for measuring the humidity, or water vapour content, of a gas (usually air). A wet and dry bulb hygrometer consists of two vertical thermometers, with one of the bulbs covered in absorbent cloth dipped into water. As the water evaporates, the bulb cools, producing a temperature difference between the two thermometers. The amount of evaporation, and hence cooling of the wet bulb, depends on the relative humidity of the air.
How does a hygrometer?
Any instrument for measuring the humidity, or water vapour content, of a gas (usually air). A wet and dry bulb hygrometer consists of two vertical thermometers, with one of the bulbs covered in absorbent cloth dipped into water. As the water evaporates, the bulb cools, producing a temperature difference between the two thermometers. The amount of evaporation, and hence cooling of the wet bulb, depends on the relative humidity of the air.
What can one measure with a psychrometer?
DA site your sources when you put stuff on here DA!It measures the moisture content or relative humidity of the air...............http://www.thefreedictionary.com/psychrometer
Formula to work out humidity?
Relative Humidity can be measured with a psychrometer. A psychrometer has two thermometers, a wet-bulb and dry-bulb. The wet-bulb has a wet cloth on one end. If the wet-bulb is colder than the dry-bulb, than you apply the information to a psychrometer chart, which tells you the relative humidity, from which you can determine "high" or "low". http://andrewslog.files.wordpress.com/2008/04/48d16354-752c-4965-9c43-024073c31186.jpg
Why does a wet bulb thermometer measure lower than a dry bulb thermometer?
It happens due to: 1)Insufficient evaporation taking place from the wet bulb due to salt and dust or other impurities on the muslin,or due to presence of no water on the muslin. 2)It maybe due to difference in sensitivities of both the thermometers whereby one of them is slow in recording sudden changes of temperatures. 3)Lastly,maybe due to faculty of broken thermometers.
What do you measure humitidy with?
You measure humidity with a psychrometer. It is a tool that has 2 thermometers connected to either side of a piece of material. One of the thermometers is normal and the other one has a wet sock on it. To use the psychrometer you spin it for 2 minutes or so and you take the temperature on the dry bulb thermometer (the normal one) and take the temperature of the wet bulb thermometer (the one with the wet sock on it). The wet one will dry out more if there is less moisture in the air because as you are spinning it you are evaporating the water into the air. The dryer air can hold more water than moist or humid air. By comparing the two numbers you can figure out the wet bulb depression, the dewpoint, and the relative humidity.
Why are there two thermometers in a hygrometer?
A hygrometer is used to measure relative humidity. The two thermometers in a hygrometer are different in that one is a "regular" thermometer and the other has some batting (a wrap) around the bulb that is kept wet. The thermometers are called a dry-bulb thermometer and a wet-bulb thermometer, respectively. The dry-bulb thermometer measures "regular" or ambient air temperature. The wet-bulb thermometer will measure a cooler temperature (usually) because moisture evaporating from the wrap around its bulb will cool it down below ambient temperature. Below zero, the wrap freezes and the wet-bulb thermometer will read a higher temperature (usually) than its dry-bulb companion. The dry-bulb thermometer will tell us the actual ambient temperature of the air. It's a very necessary baseline. There is a maximum amount of moisture that air at a given temperature will hold. (Higher air temperatures will allow air to hold more moisture and lower air temperatures will not allow as much.) What we need to know is what fraction (the percentage) of moisture the air is holding relative to the maximun it can hold. That's why we call it relative humidity. It is the wet-bulb reading that is critical now. The hygrometer looks at the difference between the dry- and wet-bulb temperatures. This number, the difference, is looked up on a psychrometric chart, and for a given ambient temperature and a given temperature difference, there is only one relative humidity that will be possible. The psychrometric chart is a calibrated "graph" that has been drawn up from precise laboratory measurements of the way the two thermometers will react for a given ambient temperature and a given temperature difference (which means a specific relative humidity). A link is provided to the Wikipedia article on the hygrometer so you can see some pics and do some additional reading.
How does a wetdry bulb work?
The thermometers are the same, one's bulb is covered in thin cloth called a muslin. The muslin is connected to a water reservoir, and water "wicks" up the muslin, evaporates, and cools the thermometer. So the wet is always (or should be) lower than the dry bulb temp. From the difference (called the wet bulb depression) you can calculate dew point and relative humidity, from printed tables. If the air is dry the depression will be higher (as there is more cooling) while the temps will be close together if the air is moist.
