An additional 10ppm of methane will change the upward IR heat flux (in tropical
atmosphere) from 289.29 W/m2
 to 286.211 W/m2
, which is a reduction of 3.08
W/m2
.
An additional 10ppm of CO2 will change the upward IR heat flux from 289.29 W/m2
to 289.29 W/m2
, which is a change of 0.13 W/m2
.
Therefore, an additional 10 ppm of methane would have a much larger impact on
the outgoing infrared flux than an additional 10 ppm of CO2 at current
concentrations
 
        
             
        
        
        
 
Condensation is a change of state from vapour to liquid while
freezing is also a change of state, from liquid to solid. Both are
change of states.
Additionally, condensation requires
much more energy to change the state of vapor to liquid than it does it
change the state of liquid to solid.
 
        
                    
             
        
        
        
<h2>Answer : </h2>
Newton's Third law of motion states : 
" Every action has an equal and opposite reaction " 
i.e If a force is applied by an object A on another object B then that object B also exerts a foce on object A, that is of same magnitude and opposite direction to the force applied by object A.
Ex - A book on a table exerts gravitational force on the table and table exerts back a normal force on the book.