phys(urgent help)

[hanna67]

can sm1 plzz explain for me the latent heat of fusion and vaporisation briefly plz?
oh nd wen doz an object have a high thermal capacity...how do we know?
thnx in advance

 

[allthatglitters16]

latent heat of is defined as the amount of heat energy absorbed or released during a change of state without the change in energy.
latent heat of fusion is when solid changes to liquid or vice versa
latent heat of vaporization is when a liquid changes to gas or vice versa.

 

[allthatglitters16]

for thermal capacity
this term is normaly used in comparison.
when an object takes more time to change state then another one considering that both have the same mass, that object has a high thermal capacity.
for e.g when comparing iron and water (5grams each), water changes states quickly so iron has a higher thermal capacity than water

 

[hanna67]

thank u so much!!
but 1 more thing if u don mind....wt abt d ques. wen they ask abt a knife bein sharpened on a rollin stone n a spark flies...wt doz this show ud abt d piece of metal...n y??

 

[allthatglitters16]

can u tell me the paper number and the year it appeared in?? I can explain better then.

 

[XPFMember]

decreasing surface area decreases rate of evaporation!Just think of no. of top molecules which escape on each if less r there less of them will escape in the same time!!

 

[allthatglitters16]

thanks
i found out therefore deleted the post.
but anyway ty

 

[Mutha Rushabh]

The Heat Capacity is very less Hence ..

 

[hanna67]

it came in year 2005 ques. 15