My Math Forum Viscosity in liquid

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 August 16th, 2012, 08:29 PM #1 Senior Member     Joined: Jan 2012 Posts: 745 Thanks: 7 Viscosity in liquid Viscosity in a liquid does not depend on the A. nature of the liquid B. relative velocity between the liquid layers C. area of the surface in contact D. temperature of the liquid E. normal reaction between the liquid layers I need reasons and explaination for your answer please! Any help will be appreciated greatly.
 August 24th, 2012, 09:10 PM #2 Senior Member     Joined: Jan 2012 Posts: 745 Thanks: 7 Re: Viscosity in liquid Viscosity is the resistance to the flow of liquid. Some liquid can pour or flow easily more than others. For example, water can be poured into a container more easily and faster into a gallon more than palm oil. If two stones, with equal mass, are thrown simultaneously, into a container of thick custard palp and a container of water, all of them size respectively , the stone moving through the water will be observed to move faster and reach the bottom of the water first. Meanwhile, the other stone moving through the thick palp will be observed to be sluggish in movement. This is due to the resistance offered to it movement by the molecules of palp in contact with the stone. Since the viscosity in water and palm oil are not the same; water and palm oil are of different nature, we say, the viscosity of a liquid is truly dependant on the nature of the liquid.
 August 25th, 2012, 07:14 AM #3 Senior Member     Joined: Jan 2012 Posts: 745 Thanks: 7 Re: Viscosity in liquid The role temperature plays in determining the viscousity of a liquid, matters alot. It is common exprience to note that some quantity of groundnut oil kept at room temperature inside a bottle does not flow out easily, when one tries to pour out the oil from the bottle. This is because there is no sufficient heat energy to increase the motion of molecules of the liquid and break the intermolecular forces of attraction, so the molecules of the oil will be moving slowly and will not have sufficient energy to cover larger distance, therefore when one views the oil at room temperature, it will appear thicker and clumpy and as result will not pour out easily from the bottle. But if the temperature is increased, the motion of the molecule will increase and the intermolecular forces of attraction, will be broken; the molecule will now cover large distances. The liquid will now appear less viscous and will then pour out more easily from the bottle.
 September 8th, 2012, 04:46 PM #4 Senior Member     Joined: Jan 2012 Posts: 745 Thanks: 7 Re: Viscosity in liquid Let me agree with the authors of the question since no body can give a reasonable explanation concerning how normal reaction between the liquid layers and area of the surface in contact affect the viscosity of a liquid. The following factors do affect or determine how viscous a liquid will be: nature of the liquid, relative velocity between the liquid layers, temperature of the liquid what about normal reaction between the liquid layers and area of the surface in contact? I don't know, but let me throw away normal reaction between the liquid layers and accept area of the surface in contact. What am trying to say in essence is that the viscousity of a liquid does depend on the following: nature of the liquid, relative velocity between the liquid layers, temperature of the liquid and area of the surface in contact but does not depend on the normal reaction between the liquid layers, therefore option E. is the only correct option.

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# Why does palm oil from a bottle flows out more easily after it has been heated

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