Friday, April 19, 2019

Fire Protection Essay Example | Topics and Well Written Essays - 1000 words

Fire Protection - Essay showcaseEven if is not the primary extinguishing agent, it may be found combined with other agents such(prenominal) as foam or may be used extensively for cooling containers in silver-tongued petroleum gas (LPG) fires. It is essential that every fire fighter understand the behaviour of water in difference circumstances.Most of the motions that we find on earth involve friction. Friction is a force which occurs when devil surfaces rub against one another. If you roll a b alone slowly across the floor, the balls speed decreases and eventually it bread. It stops because the friction between the ball and the floor pushes against the ball and reduces its motion. When you rub your hands together, you feel the resistance due(p) to friction. By rubbing your hands together, you are doing work. The result of this work is the heat produced.Water when pure is colourless, odourless, and transparent with a molecular com function to two atoms of hydrogen combined with one atom of oxygen. A cubic decimeter of water has a mass of 1 kilogram (1 kg), corresponding to a downward force of 9.81 newtons (N). A cubic meter of water exerts a downward force of 9810 N, or 9.81 kilonewtons (kN). This is more commonly reckoned as 10 kN. The mass of water varies with the degree of purity. Ordinary sea water weighs approximately 10.0 newtons per liter (N/litres). elegant water has a freezing point of 0... It is virtually incompressible, and an increase of 1 bar only causes a decrease in volume of 0.000 002 per cent.As a fluid, water has volume but is incapable of resisting convince of shape, i.e. when poured into a container it exit adjust itself irrespective of the shaper of the latter, and will come to rest with a train surface. This is because thither is very little friction or cohesion between the individual molecules of which water is composed.2. PrincipalCharacteristicsofPressure at that place are six basic rules governing the principal characteristics of obligate in liquids. These area. Pressure is vertical to any surface on which it actsIf a vessel having flat sides contains water, and that water has attained a position of rest, then the pressure on all sides of the vessel due to the weight is perpendicular to those sides, as shown by the direction of the arrows.b. Pressure at any point of a fluid at rest is of the same intensity in all directionsIn a line of piping or hose, two pressure gauges are inserted. If the water is at rest because a valve or hand-controlled branch has been shut down, the pressure gauges will register identical readings showing that the pressure at any point of a fluid at rest is the same in all directions.c. Pressure utilise from outside to a fluid contained in a vessel is transmitted in al directionsA hollow sphere with pressure gauges just about the circumference has been filled with water, and pressure is applied. All the gauges will show the same pressure reading, providing that when pressure is applied to a fluid in a confined space, that pressure is transmitted equally in all directions.d. Downward pressure of a fluid in an open vessel is proportional to its depthIf there are three

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