P638 CEEFAX 2 638 Mon 20 Jan 00:55/54
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  
               ENERGY                   
                                        
 * When an ice cube melts it takes      
   enjtgy from its surroundings.        
                                        
 * Enjtgy is measured in joules ot      
   kilojoulis (j or kj).                
                                        
 * If you are a small child you need    
   7,500 kj a day.                      
                                        
 * Someone doing heavy work such        
   as digging holes, would need         
   16,000 kj a day.                     
                                        
 * A 100 gram apple contains 150 kj of  
   enjtgy.                              
                                        
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