Question

2. Which one of the following statements
about thermal conductivity is correct?
Give reason.
a) Steel > Wood > Water
b) Steel > Water > Wood
c) Water > Steel > Wood
d) Water > Wood > Steel

Answer 1

Answer:

water,steel,wood is the correct statement

Explanation:

Because water is more good conducter of heat and electricity and below it is steel which is not so thermal conductivityand below it is wood which is very poor or not a conductor of thermal conductivity

Answer 2

                        Thermal conductivity

Thermal conductivity means that a substance has a capacity to conduct heat and electricity or it just let heat and electricity to  pass through its own body .

The correct answer is-

C) water > steel > wood

• It is so because water is apart from liquid metals, water has the highest thermal conductivity of any liquid.  

• Steels thermal conductivity is around 45 watts per kelvin per meter. So this material is a good thermal conductor but comes after water.  

• Thermal conductivity declines  as the density of the wood decreases         or it do not conduct heat and electricity. So it comes at last as thermal conductor.