Temperature Humidity
Calculate vapor pressure and humidity from temperature?
If the temperature is 86 degrees F and the dew point is 68 degrees F, what is the vapor pressure?
What is the saturation pressure?
What is the relative humidity?
Please help, I am quite confused.
The average pressure at sea level on earth is 1013.25 hecto-pascal. The average temperature on earth is 15 degrees Celsius. Under those condition, a cubic meter of air can’t contain more than 13 grams of water. When it happens, the relative humidity is 100 percent. It is the ratio between of what a parcel of air can contain at a given pressure and temperature. For example, the colder there is, the less moisure the air can contain.
The vapour saturation pressure is the pressure at which, for a given temperature, the moisture must condense.
I have never liked the word, vapour, because it actually means: tiny droplets of water sustained in the air. But for some, it means water in a gaseous form, which is entirely different.
Anyway, to find the relative humidity and vapour pressure, you need a chart or a table. What is mostly used in meteorology is called a psychrometric chart. This is because the measurement is done with a wet & dry bulb thermometer, often called a psychrometric thermometer. If you don’t have such a chart – which you should in order to solve your problem – you’ll find many of those on the internet. Pick one that uses the units you are used to.
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MASTECH MS6503 Humidity Temperature Meter $179.90 |
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DIGITAL LCD TEMPERATURE HUMIDITY METER ALARM CLOCK TEMP $9.99 |
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Indoor/Outdoor Thermo-Hygrometer Temperature Humidity $3.69 |
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New Temperature Thermometer Hygrometer Humidity Meter $0.99 |
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Multi-functional Clock Temperature Humidity Meter 3in1 $9.89 |
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847 Multi-functions Humidity Temperature handheld Meter $65.00 |
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Multi-functional Clock Temperature Humidity Meter 3in1 $9.89 |
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HS1101 Temperature & Relative Humidity Sensor Module $5.99 |
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Digital Temperature Humidity Meter Thermometer $6.69 |
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Multi-Function Temperature Humidity Digital Wall Clock $14.99 |