Tip 1: How to measure humidity

Humidity measurements are required as a physicist and forecaster.And we ourselves this question must also be interested, especially if we are sitting for long periods in the same room.After all, the humidity affects the human body, because of that, and it must be controlled.There are two main types of devices that measure the humidity.They are distinguished by the device and the principle of work.It hygrometers and psychrometers.
Guide
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hygrometers How it works is to analyze the effects of fluctuations in humidity on certain body and matter.For example, hairline hygrometers based on the ability of skimmed human hair to change its length in response to changes in humidity.Such hygrometers measured humidity range 30-100%.The film hygrometers moisture-sensitive element is an organic film.
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Although the film, and a hair hygrometer can not give such accuracy that gives psychrometer.But in winter the main means for measuring the relative humidity of the air is still hygrometers, which are al
so weighted, electrolytic, and ceramic condensation.Each of these has its own characteristics of hygrometers.But one database for all: the hygrometric method of measuring or determining the dew point.
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psychrometric method for measuring the relative humidity is also very popular.In hygrometers error can reach 5%, but much more accurate psychrometers.Standard simple psychrometer consists of two thermometers.A dry, and the other - wet.The second is wrapped in a cotton cloth dampened with water.The evaporating water cools the thermometer, but this time the second (dry) thermometer records the temperature of the surrounding air.Indications eventually transferred to a recording device which determines the relative humidity in the room based on the temperature difference between dry and wet thermometer.
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If no psychrometer or hygrometer you do not, the humidity can be measured without them.Type in a glass of cold tap water and put it in the refrigerator for a couple of hours.Make sure that the water temperature drops below 5 ° C mark.Place the stack in the room, so that she was away from heating appliances.Now watch the pile for a few minutes.
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If the walls of the stack started to sweat and dried out in five minutes, so humidity is very low, that is, the air is dry;On average humidity
you "inform" the wall of the stack, and the remaining fogged;
If on the glass surface within five minutes creates small streams of water, then air humidity is high.

Tip 2: How to determine the soil moisture

lack and excess moisture is bad for the normal development of plants.Considering the needs of each crop to water and moisture regulating soil , it can be grown on the site a rich harvest.To determine the irrigation time possible and without special equipment.
How to determine the soil moisture
you need
  • - shovel.
Guide
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Determine if there is enough moisture in the soil, on the appearance of plants.With a lack of moisture leaves wither and fall.Help may be a good watering and irrigation.Determine humidity soil can be another way.Dig a hole depth of 20-30 cm and attach the back of the hand to the wall of the soil cut.If the layer with the roots of dry or slightly moist, the plants should be watered.
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Determine soil moisture the earthen ball.To determine the optimal timing and rate of watering plants, you can use a small sample.Take a handful of soil from her and roll the ball.If it falls apart on the hand - the soil is dry.Here the plants for normal growth need extra watering.When the sample is ground slightly cools the hand - is a fresh soil.During compression, it almost does not decay, because filled with water.This land is suitable for normal growth of plants and do not require watering.If we take the sample out and leave marks on the skin - a moist soil.It holds its shape well the ball, but rolling out in the cord disintegrates.Crude soil sticks to your hands, but is easily formed and the ball, and the power cord.Moist areas will require additional costs for water abstraction, otherwise they grow some weed.
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Displays the status of the soil and its appearance.You'll be able to determine its moisture site selection for a country house.Parched land lighter in color, with a cracked crust and dusty with a light breeze.The early and late clocks, it does not darken from moist air.Grassy cover dry and yellow.There are feather grass and lichens.The fresh soil - green mosses, cranberries, and broad-leaved lungwort male fern.On wet ground plants with lush foliage: a lot lapchaptki, loosestrife and blueberries.Excess moisture is immediately noticeable.The water comes to the surface of the small plants carpet covered the ground.There prevails Ranunculus repens, Kukushkin flax, meadowsweet.
Note
If after planting, you can not just pour the seeds, roll on the ground.
Helpful Hint
Note the weeds growing in the humid areas.There are a lot of horsetail, smock and timothy.
Note
If you have a special instrument for measuring humidity - hygrometer, then determine what the humidity in the room is not difficult.But what if the hand of such a device is not present.Learn approximate humidity in the apartment, and can be on their own.How to measure humidity without hygrometer.There is a fairly simple way.
Helpful Hint
the winter - dries the air by district heating, often in the summer and humid.How to measure the humidity of the air in the apartment and bring it to the norm?Depending on the moisture level of the concentration of water outside the premises.In winter, this difference is significant due to the operation of heating.To measure humidity, use a good old hygrometer (personally, I was still on my grandparents - 3 in 1: thermometer, hygrometer and barometer).
Sources:
  • measurement of humidity in the apartment

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