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

Fire Protection - Essay ExampleEven if is not the primary extinguishing agent, it may be found combined with other agents such as foam or may be used extensively for cooling containers in liquid crude gas (LPG) fires. It is essential that every fire fighter understand the behaviour of wet in difference circumstances.Most of the motions that we find on earth call for clangoring. Friction is a army which occurs when two surfaces rub against one another. If you roll a ball slowly across the floor, the balls speed decreases and eventually it stops. 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 to friction. By rubbing your hands together, you be doing put to work. The result of this work is the heat produced.Water when pure is colourless, odourless, and liquid with a molecular composition to two atoms of hydrogen combined with one atom of oxygen. A liter of irrigate has a mass of 1 kilogram (1 kg), corresponding to a downward force of 9.81 newtons (N). A cubic meter of water supply 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).Pure 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 change of shape, i.e. when poured into a container it will adjust itself irrespective of the shaper of the latter, and will come to rest with a level surface. This is because in that location is very little friction or cohesion between the individual molecules of which water is composed.2. PrincipalCharacteristicsofPressureThere are six basic rules governing the principal characteristics of hale in liquids. These area. Press ure is perpendicular to whatsoever surface on which it actsIf a vessel having flat sides contains water, and that water has attained a position of rest, consequently the pressure on all sides of the vessel due to the weight is perpendicular to those sides, as sayn 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 applied from outside to a fluid contained in a vessel is transmitted in al directionsA hollow sphere with pressure gauges around 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 co nfined 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