Ethyl ether acetic acid (another name for ethyl acetate) has a formula С4Н8О2. Represents a colorless liquid, soluble in some organic substances such as benzene, acetone. In water, the ethyl acetate soluble much worse. It has a characteristic sickly sweet-sharp smell, somewhat resembling the smell of acetone. How can I get this stuff?

The solvency of enterprises especially valued by investors based on the value of liquidity. In a broad sense under the liquidity understand the time that the company is required for the conversion of assets into money. Expect liquidity by comparing the means of the asset with short-term liabilities. However, for accurate calculation, there are specific formulas.

Nightingale – virtuoso singer, which nature has no equal. The most "talented" Nightingale in the tunes can be heard up to 40 lap. The knee is a recurring combination produced by the bird, and the more the knees in the song, the forget and more pleasant for perception and the higher valued Nightingale. Leaping motives of this birds singing, you can listen to only in early spring. And this is solely due to the behavioral features of Solovyov.

Particle concentration is a measure of how many particles of the substance is in any volume. It is calculated by the formula: c = N/V, its dimension is 1/m^3. It is often necessary to determine the concentration of molecules, and the analyte can be in any state of aggregation: solid, liquid or gaseous.

Spring is a component of the car's suspension, which protected the car from irregularities in the road, but also provide the desired height of the body above the road, which greatly affects the handling of the vehicle, comfort and payload capacity. As a result of the tests for each vehicle select the optimum stiffness of the suspension springs under certain traffic conditions.

When solving a topographical, physical, and mathematical tasks is often required to determine the rectangular coordinates of the object or point. Cartesian rectangular coordinates of the point located on the plane, called the distance between this point and the two mutually perpendicular straight lines. If the point is in space, distances are measured to three mutually perpendicular planes.

An inductor can store magnetic energy during the flow of electric current. Its main characteristic is its inductance, which is denoted by the letter L and is measured in Henry (H). The inductance of the coil depends on its characteristics.

Blue crystals of copper sulfate are extremely beautiful. Experience in cultivation may be a long time to interest your preschooler and even the school child will love to watch grow on the string of crystals. For high school student this can serve as an introduction to one of the most interesting science — crystallography.

Phenol is the simplest representative of the aromatic alcohols has a chemical formula С6Н5ОН. This substance is widely used in various industries, mainly in the production of phenol-formaldehyde resins. Represents a colorless, strong-smelling crystals, the light receiving pink. In industry, phenol get different methods, including chlorobenzene. Chlorobenzene – a substance with the chemical formula С6H5Cl.

Resistance is a kind of ability of the circuit to prevent the passage through it of an electric current. They have a variety of materials, such as copper, iron and nichrome. The total resistance is the resistance of the entire electric circuit as a whole. It is measured in ohms. Need to know the resistance of the circuit to estimate short circuit currents and selection of switching devices.

The optical power of the lens. It is measured in diopters. This value indicates the increase in the lens, i.e. how strongly the rays are refracted in it. This, in turn, depends on the size changes of the objects in the images. Typically, the optical power of the lens is specified by its manufacturer. But if such information is not, measure it yourself.

When orienteering is often necessary to move it in the directions specified in advance and not on the sides of the horizon. How this can help us to compass? For movement in the direction you need the ability to calculate the azimuth, i.e. the value that characterizes the angle between the North direction and the direction to the selected landmark.

Under the half-life is commonly understood as a certain period of time, which manages to disintegrate half of the cores of a given amount of substance (particles, nuclei, atoms, energy levels, etc.). This value is the most convenient to use, since complete disintegration of substance ever happens. Disintegrated atoms could form some intermediate States (isotopes) or to interact with other elements.

Concentration is the value which characterizes the qualitative composition of the solution. Concentration is called the number of the solute or its mass to the total volume or mass of fluid. Thus, the most important characteristics are the mass and volume fraction.

Coil inductance are elements in the marking which parameters are not usually specified. Moreover, it often coils wound independently. In both cases, to determine the inductance of the coil is possible only by means of its measurement. It can be carried out by various methods, involving the use of a variety of complexity of the equipment. Some of these methods are laborious and require calculations. But active LC meters free from these shortcomings allow you to measure inductance , quickly and without additional calculations.

Rosin is applied in soldering of various metals in the electronic industry and all kinds of repair work at home. This is a solid crystalline substance is also needed when cooking some protective varnishes and mastics. Rosin dancers rubbed the soles, and the musicians bows. So its application range is very wide. To make the rosin can be themselves.

To make a powerful electromagnet, take a good magnetic core, wrap it in an insulated conductor, and connect to the current source. The power of such an electromagnetand can be adjusted in various ways.

Lightning – a giant electric spark discharge in the atmosphere, usually accompanied by a light flash and thunder. Between the flash and heard the discharge of thunder, there is a slight delay, the duration of which it is possible to calculate the distance to hit lightning.

To melt the soap without heat, of course, will not work. But with gas or microwave oven, ensuring that it is not difficult. To melt the soap a big piece for a very long time, so it must first be crushed.

When exposed to the beam shear forces bending moments occur, which are the main destructive factor, therefore, when designing structures it is important to calculate the effect of bending moments on different sites. To illustrate the effects of bending moments, they are plot.

To distinguish a ruby from a fake is difficult. These stones people fake a long time ago and achieved good results. But there are signs that help to determine the authenticity of the ruby.

In normative documents on the design grid to indicate wire size, and caliper can measure only the diameter of the core. These values are interlinked and can be translated one into another.

The bloodthat flows through arteries and veins, contains a large number of different cells that perform specific functions and are responsible for its color. The blood may be dark red or have a lighter shade. All this is due to several reasons.

Reference books on electrical engineering there is a table with a cross sectionof the mi cables for use in different conditions. A caliper can also measure the cross section and diameter. Knowing any of these values can be calculated according to the formula and another.

The first mechanical clock with a dial and pointers were of the tower, and residents of medieval cities was not necessarily know how to determine time with them. It was enough to count the number of strikes – because of the advent of the new hours proclaimed the fight. Today, although widespread electronic clock, learning to tell time looking at a mechanical clock, once did not.

Sometimes a person needs to accurately indicate the metals in the periodic Table. As the man who practically owns the chemistry, can determine whether a particular element of metal?

Gold is a noble metal soft yellow. Nobility of this metal is estimated that it is resistant to aggressive media, i.e. not oxidized under the influence of acids and alkalis. Extracting gold from gold-bearing materials in two ways: mechanical (manual) or chemical.

A quartz crystal resonator is a crystal electronic device, capable of supporting a resonance at a certain frequency. It has high stability and accuracy. To verify that it works, you have to get one of the circuits crystal oscillators on field or bipolar transistors.

People are engaged in gold mining since ancient times. Even during the Neolithic age, ancient people began to attract the precious metal, which is often found intact nuggets. And as of now get the gold, when gold nuggets on the Ground is almost gone?

The river is life. Since ancient times people settled on the banks of rivers and rivulets, fed from the river and it sang in his songs. The river is the and inviting, calling and leading out to the ocean.