Answer / subbu

Water shows unusual expansion. If we take a cube of ice at -5°C and heat it, it expands till ice starts melting. During melting its temperature remains 0°C but its volume decreases. If heat is continuously supplied to water at 0°C, it further contracts up to 4°C and then it starts expanding. Thus water has its minimum volume and maximum density at 4°C.

The anomalous expansion of water helps preserve aquatic life during very cold weather. When temperature falls, the top layer of water in a pond contracts, becomes denser and sinks to the bottom. A circulation is thus set up until the entire water in the pond reaches its maximum density at 4°C. If the temperature falls further, the top layer expands and remains on the top till it freezes. Thus even though the upper layer are frozen the water near the bottom is at 4°C and the fishes etc. can survive in it easily.

Answer / mayank jansari

at that temp water just start cooling and
m=density* volume
so density of water=mass of water/volume of ice

Answer / s.muthupandi

at this temperature voulume of the water decreases we know
density=mass\volume so that at 4*c water density is high

Answer / vishram kulkarni

i have not have cleared the question

Answer / raj.48000

it is due to the cage like structure of water.

what is the difference between suction lift & suction head?

4 Answers   NTPC,

how to design a sheet metal bracket?

7 Answers   TATA,

In a Steam Turbine, where does the maximum loss of efficiency occur ?

14 Answers   MahaGenco,

1.how do you purchase the sheetmetal,machined components for OEMS? 2.WHAT IS THE SYSTEM TO BE MAINTAINE FOR PURCHASE ACTIVITY? 3.HOW DO U DO THE PRICE NEGOTIATIONS & ITS PROCEDURES? 4.WHAT ARE THE PROBLEMS WILL FACE WHILE PURCHASING THE COMPONENTS& WHAT IS THE SOLUTION TO OVERCOME BY THAT ONE 5.WHAT IS THE NECESSARY NOTES TO MAINTAIN THE PO& RELEASING THE PO?

0 Answers   BARC, CADD,

In 10.00-20 tyre. what is the meaning of .00 ( after10) ?

0 Answers  

Which reactor requires no moderator ?

0 Answers  

What is extruded aluminium used for?

0 Answers  

how to masure rake or helix angle of drill ?

0 Answers  

pls ,send me technical questions of jindal steels and power ltd

0 Answers   Jindal,

The higest value of thermal conductivity is expected for a.) Solid ice b.) Melting ice c.) Water d.) Boiling water Give the thermal conductivity value for each.

2 Answers  

how can u increase the efficiency of a power plant without changing the effort?

0 Answers  

what are the uses of graphite electrode in various field.

3 Answers   Bateman Engineering, Elete, HEG, Sail,