Answer:
The  value is  
Explanation:
From the question we are told that 
    The volume of  liquid nitrogen is  
    The  density of  nitrogen at gaseous form   is   =  The dry air at sea level
  =  The dry air at sea level
     
Generally the density of nitrogen at liquid form is  
          
And this is mathematically represented as
       
=>   
Now the density of  gaseous nitrogen is 
        
=>   
Given that the mass is constant 
        
         
=>   
        
 
        
             
        
        
        
I believe the best answer is law, as scientific laws are accepted to be true under the proper conditions. 
        
                    
             
        
        
        
<span>The motion of the medium is parallel to a longitudinal wave 
and perpendicular to a transverse wave.</span>
        
                    
             
        
        
        
Answer:
a) 15 b) 60 i think is the answer