One of the most important parameters of soil is the pH level - the acid-alkaline balance. The optimum acidity of the soil the plants grow in the best way. Saturation of the soil acid salts allows you to absorb the nutrients, so you need to take action to reduce the level of acidity.

Iron is one of the most important microelements essential for the normal functioning of the human body. Its deficiency may lead to serious diseases. However, the excess is also harmful. As soluble compounds of iron are often found in drinking water, it is very important to be able to identify this chemical element and calculate its concentration.

A magnet is a body that has its own magnetic field. In a magnetic field there is some impact on the external objects that are close, the most obvious is the ability of a magnet to attract metal.

Angular acceleration is a pseudovector physical quantity that characterizes the rate of change of angular velocity. Thus, the angular acceleration characterizes the rotational motion of a rigid body, whereas linear acceleration - its forward movement. As the linear acceleration of the body is related to its velocity and its angular acceleration is related to its angular velocity. Between angular and linear acceleration inm there is a link.

About Belye nochi, the Russians hear almost every year – mainly due to the rich cultural life of St. Petersburg, which at that time held the theater festival with the same name. Although as a natural phenomenon of white nights can be observed not only in Russia but in other countries, which capture the polar region in Norway, Denmark, Sweden, Iceland, Northern Canada and Alaska.

Almost all people are afraid of thunderstorms or, at least, fear it and prefer to wait in a safe place - and this is the right approach. The sky darkens and tightens, the sun disappears, but the thunder and gleaming lightning – nature on the rampage, and it can be dangerous.

In the basis of the occurrence of many natural processes and phenomena – rain, snow, frost, fog, dew – lay is an amazing physical property of water. Dew is water droplets that appear on the vegetation on summer nights and disappearing under the sunlight in the morning. There is a figure of speech: "had the dew". Indeed, to some extent, Rosa – a form of precipitation. However, it does not fall out as, for example, rain or snow from clouds, and, strictly speaking, this is not exactly, and not only atmospheric water. And what then?

Moss - specific plant species, which often inhabit the soil and other surfaces, for example, the bark of trees or even stones. The moss has its own particular distribution.

Due to increased migration along the chain of charges increases the frequency of the current. In turn, the increase in the number migrated per unit of time charges amounted to an increase of current in the circuit and reduce its resistance, and this can be achieved by using a circuit with a capacitor.

Pure oxygen in large quantities is used in medicine, industry and other fields. For these purposes it is obtained from air by liquefaction of the latter. In the laboratory the gas can be obtained from the oxygenostergade compounds, including water.

Time is a complex category, which can be interpreted in different ways, depending on which point of view you look at her. At the science level is a measurable physical concept, the measure of processes of the fourth dimension of our world. From the point of view of psychology time is subjective for each person and depends on his perception and awareness of changing events. He and the other approach allows us to suggest ways to speed up the time.

Measurement of the electromagnetic field are carried out in two directions. First, find its frequency using the Hertz dipole or resonant circuit. To do this, tune them in resonance with an external electromagnetic field and calculate their own frequency. The second is its intensity. For rough measurements of the intensity of use an inductor (solenoid). For a more accurate – special devices.

The ratio of transformation is one of the fundamental parameters of any transformer. If this figure is unknown, it is possible to determine eksperimentalnim way.

Radiation is ionizing radiation, which is divided into several types. High doses of radiation are dangerous to health and life. To measure the effects of radiation on the body is used the unit sievert. More common size measurement of radiation – grey – means the radiation dose absorbed by the substance.

The dew point defines one of the most important characteristics indicating the state of the environment. Is the temperature at which moisture in air begins to condense. This situation is taken into account in the calculation of construction projects, climatic systems and the design of a variety of household and industrial machinery, in the manufacture of paints and anti-corrosive compositions.

Phytoncides called biologically active substances formed by plants and have antimicrobial properties. First and foremost, this kind of protection of plants. Some are volatile – such as, for example, essential oils can be extremely beneficial to humans.

In 1905 albert Einstein suggested that the laws of physics are universal. So he created the theory of relativity. The scientist spent ten years to prove his assumptions that became the basis for a new branch of physics and led to new ideas about space and time.

All the world is composed of micro, small bricks that form the Universe itself. Planets, stars, water, earth, air, every person – everything is the visible result of an invisible effect. But it can be investigated and understood.

Mass percent is the ratio of the mass of any component of the solution, alloy or mixture to the total weight of the substances in this solution, expressed in percentageAh. The higher the percentage, the more the content of a component.

Power factor is called the measure of distortion of the current and voltage of the mains. It is due to the impact load, and its increase leads to increase active power and reduce losses from useless circulation of reactive energy.

CFRP (uglerodistykh, carbon fiber) is a composite material based on carbon fibers and epoxy resin. CFRP has a wide scope. Carbon materials can be found in a variety of industries.

The principles of operation of ammeter and voltmeter based on one and the same, namely, the interaction of the magnetic field with electric current, but there are a number of distinctive features, allows to measure either current or voltage.

According to Ohm's law, increasing the current in the circuit is possible if at least one of two conditions: increase voltage or decrease resistance. In the first case, adjust the source current for another with more electromotive force; in the latter, pick up the guides with less resistance.

The kinetic molecular theory, which explains properties of matter based on several postulates, introduces a new definition of "ideal gas". Any gas that satisfies these postulates is ideal. Strictly speaking, none of the gas that exists in nature, is not ideal. However, this abstraction helps to simplify the concept of the processes occurring inside gaseous substances.

Tungsten (lat. Wolframium) got its name from the German Wolf — wolf and Rahm — cream ("wolf foam"). For a long time for this metal couldn't find a practical application. Only at the end of the XIX century, it began to produce tungsten steel and various hard alloys.

On Earth there are about 5000 kinds of flies, of which about 1000 live in the vastness of Russia. Many of these insects than not annoy the person. But there are varieties that are the constant companions of man and have a great epidemiological significance. These insects belong to synanthropic species. It's the common housefly, house, market, blue cold, green flesh.

Planet Earth could be called Ocean, because much of its surface is a vast water expanses. The ocean depths conceal untold riches, which include not only flora and fauna but also valuable mineral resources. But until now scientists have not reached a consensus regarding how many oceans there are on the planet.

In modern physics there are several types of interaction of particles: strong, weak and electromagnetic. They require the Standard model of particle physics in which fundamental particle is the quark.

Lightning storm – the mighty and majestic phenomenon of nature, able to inspire awe with its power. In ancient times lightning was considered a manifestation of supernatural forces, the evidence of God's wrath. However, with the development of science for mankind it has become clear that there is nothing mysterious or supernatural in nature, no lightning. Their occurrence and properties are subject to understandable physical laws.

A study in the construction of higher education institutions in disciplines such as, for example, mechanics of materials or structural mechanics require the determination of the attachment reactions of the supports. Not calculating these reactions, it is impossible to calculate the tasks on strength, stability and rigidity, and therefore not learn the material that serves as the basis for the design of buildings and structures.