Advice 1: How to measure humidity

Humidity measurement is necessary as physicists and weathermen. And ourselves this question, too, should be interested in, especially if we sit for a long time in the same room. Because humidity affects the human body because we need to control. There are two main types of instruments for measuring humidity. They differ in the device and principle of work. It hygrometers and psychrometers.
Instruction
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The principle of operation of hygrometer is to analyze the effect of variations in humidity on a certain type of body and matter. For example, hair hygrometers based on the ability of skimmed human hair to change its length in response to changes in humidity. Such hygrometers measure the humidity in the range 30-100%. In film hygrometers moisture sensitive element is an organic film.
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Although film and hair hygrometers are not able to give such accurate measurements, which is given by the psychrometer. But in winter, the main means of measuring the relative humidity of the air are all the same hygrometers, which are also the weight, the electrolytic condenser and ceramic. Each of these types of hygrometers has its own characteristics. But the base one for all: the hygrometric method of measurement or determination of the dew point.
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Psychrometric method of measuring relative humidity is also very popular. The hygrometers accuracy can reach 5%, but psychrometers much more accurate. Standard the simplest psychrometer consists of two thermometers. One dry and the second wet. The second is wrapped in water soaked cotton cloth. Evaporating water cools the thermometer, and at this time the second (dry) thermometer shows the temperature of the surrounding air. Testimony in the end are transmitted to the evaluation unit, which determines the relative humidity of the indoor air based on the difference in temperature between the dry and wet thermometers.
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If neither psychrometer or hygrometer you do not, humidity can be measured without them. Type in a glass of cold tap water and place it in the fridge for a couple of hours. Make sure that the water temperature has not dropped below $ 5. Put a stack in the room so she was away from heaters. Now watch the pile for several minutes.
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If the walls of the stack began to fog up and they're dry in five minutes, so the humidity is very low, that is, the air is dry;
On average humidity is "misleading" wall of the stack, and the remaining fogged;
If the surface of the glass within five minutes of the formation of small streams of water, so the humidity in the room high.

Advice 2: How to determine the soil moisture

The shortage and excess moisture affects the normal development of plants. Considering the needs of each crop to water and adjusting the humidity of the soil, can be grown on his land a rich harvest. To determine the time of irrigation is possible without special instruments.
You will need
  • - a shovel.
Instruction
1
Determine if there is enough moisture in the soil, in the appearance of plants. The lack of moisture the leaves fall and wither. To help can good watering and irrigation. To determine the moisture content of the soil can be another way. Dig the hole to a depth of 20-30 cm and attach the back side of the brush to the wall of the soil slice. If the layer with the roots of dry or slightly moist, you should water the plants.
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Determine the moisture content of the soil in the earthen ball. To determine the optimal terms and norms of watering plants it is possible to use a small sample. Take a handful of soil and roll it round. If it crumbles in the hand the soil is dry. Here the plants for normal growth require additional watering. When the sample of the earth slightly cools the hand is the fresh soil. When compressed it is almost not decomposed, because filled with water. Such land is suitable for normal growth of plants and requires no irrigation. If you take a sample in hand and on the skin are traces is moist soil. It keeps the ball shape, but when rolling the cord disintegrates. Wet soil is sticky, but is easily formed in the ball, the cord. Wet areas will require additional costs for water abstraction, otherwise they grow some weed.
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Shows the status of the soil and its appearance. You'll be able to determine its moisture content when selecting a site for a country house. Parched earth of a lighter color, with a cracked crust and dusty with a light wind. In the early and late hours it does not darken from the wet air. Herbaceous cover is dry and yellow. Meet the feathery grasses and lichens. In fresh soil, green moss, cranberries, broad-leaved lungwort, and male fern. In wet ground plants with succulent foliage: many lapchatki, loosestrife and blueberry. Excess moisture immediately noticeable. The water comes to the surface small carpet plants cover the land. Here is dominated by creeping Buttercup, Kukushkin flax, meadowsweet.
Note
If after planting you can water the seeds, roll the soil.
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Pay attention to the weeds growing in wet areas. There are a lot of horsetail, core meadow and Timothy.
Note
If you have a special device to measure humidity – hygrometer, to determine what the humidity in the room is not difficult. But what if there is no such apparatus. Find the approximate values of the humidity in the apartment and on their own. How to measure humidity without a hygrometer. There is a fairly simple way.
Useful advice
In winter the air dries due to the Central heating, in summer it often happens that the humidity is very high. How to measure humidity in the apartment and bring it to normal? Depends on the humidity level of the concentration of moisture outside. In winter, this difference is significant as a result of the heating. To measure the humidity, use the good old hygrometer (personally I still have from my grandparents – 3 in 1: thermometer, hygrometer and barometer).
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