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5.1 Pressure, as a physical quantity, as opposed to temperature, is clearly defined as the force acting normal to a unit surface, and is measured in Pascals (Pa). Most often, difficulties arise in determining the levels and units of pressure. It looks like the inside of the steam boiler. Essentially, a steam or hot water boiler is a large kettle for heating water, consisting of a large number of pipes that are closed tight outside. In the photo, exactly located pipelines are clearly visible (specialists usually say bundles of pipes) that accurately and geometrically bend around holes for burners . Unlike the kettle, the fire burns inside the boiler. As a matter of fact, it turns out that this Matilda Kshesinska (and her spouse of Prince Sergei Mikhailovich), who turns out to be Matilda Kshesinskiy, turns out to be the first power engineers in Strelna (village near St. Petersburg). At her dacha was the first in the entire village own power plant. At the same time, there was no electricity even in the nearby Konstantinovsky For servicing the newest system, as it should be, a real