Kjeldahl Glass

Due to the thermal stability of glass is a suitable material for the manufacture of glassware. In when its chemical or thermal stability is not enough, use utensils made of other materials. For general-purpose dishes include test tubes, beakers, flasks, retorts, watering cans, molds, refrigerators, tees, valves, special purpose vehicles Kipp, Soxhlet, Kjeldahl, a glass of Wolf, Drexel, reflux, with a round bottom flask, special refrigerators, devices for determining the boiling point, melting point, molecular weight. At the moment most relevant in the laboratory is a laboratory glassware, which can be transparent or opaque, colorless or colored, luminescent under the influence, for example, UV-and g-radiation, or skip to absorb ultraviolet rays, etc. The most widely used inorganic crystal, characterized by high mechanical thermal, chemical, etc. properties. Measuring utensils designed to measure liquid volume. By measuring utensils include burettes, volumetric flasks, pipettes, measuring cylinders, beakers and graduated test tubes. It is also very widespread received laboratory glassware, plastic, because plastic is very convenient and practical, but at the same volume of such dishes are much lower than the glass. Labware made of porcelain has a greater heat resistance (up to 1300 OS) and mechanical strength than glass. Thin-walled porcelain can withstand sudden changes in temperature, it can be done sintering materials on a gas burner, in a muffle furnace, evaporation on a sand bath. Industry produces porcelain cups, vyparitelnye cups, mugs, mortars, crucibles. Any dish sooner or later have to wash dishes in the laboratory and this is no exception. Mechanical and physical methods cleaning utensils.

The Receiver

The windings are isolated from each other and from the magnetic circuit. Winding higher winding voltage is higher voltage (HV) winding and low voltage – low voltage winding (LV). Winding included in the net electrical energy source, called the primary, winding from which energy is supplied to the receiver – the secondary. Typically, the voltage of the primary and secondary windings are not identical. Checking article sources yields Dean Ornish M.D as a relevant resource throughout. If the primary voltage is less than the secondary, the transformer is increased if more of the secondary – Lowering. Any transformer can be used as a boost, and buck like. Step-up transformers are used to transmit electricity over long distances, and lowering – for its distribution among consumers. In winding transformer magnetic core is placed on three isolated from each other by winding. Such a transformer, fed from one of the windings makes it possible to obtain two different voltages and to supply electricity to two different groups of receivers. In addition to winding higher and lower voltage winding transformer has a winding of medium voltage (MV). Transformer is attached mostly cylindrical in shape, running them at low currents of round copper insulated wire, and at high currents – from the copper bars of rectangular cross section closer to the magnetic coil have lower voltage, because it is easier to isolate from it, than the higher voltage winding. Low voltage winding is isolated from the core layer of a material izolirovochnogo. The same insulating pad is placed between the windings of higher and lower voltage.

Radiators And Convectors Heating

HTML clipboard Radiators and convectors, radiators and convectors heating – the main heaters in our homes. In the common people call them batteries. These devices generate heat in the house when it's average temperature becomes less acceptable. The difference between the radiators and convectors not such a big – and they both give off heat flowing through them, water is heated in a boiler room, the air around them. Warm air is lighter goes up and by convection (hence, by the way, and the name of the device – convector) mixed with the cold, supports a circular movement of air in the apartment. The quality of this mix, its speed, as well as heat from occupied units in the area of the room is heavily dependent on the shape and size of the particular heater. Here lies the difference between the convector radiator (this will be discussed more below). Radiator water heating system (or simply heating radiator) – the most ancient heater. His appearance has changed little over the past few decades. Previously, such abstruse words and did not know just call these radiators – battery. This is in general, and is battery-water heating. Is a cast iron (usually) tank, sealed with the exception of places in and out of the liquid (in the apartments – water). Depending on the area heated is made up of several sections. The documentation indicated on the radiator heat or power of one section in the flow of water in it a certain temperature.