Definition of expssion:
		
            
            
              
                "The expansion of metals and plastics in response to heat is well understood."
              
            
          
            
              °The fractional change in unit length per unit length per unit temperature change.
            
	 
 
		
		
		Definition of expssion:
		
            
            
              
                "The expansion of metals and plastics in response to heat is well understood."
              
            
          
            
              °The fractional change in unit length per unit length per unit temperature change.