the state of objects in thermal contact when they no longer change each other's temperature.
                                                            
                                                     
                        
                                                
                        
                        
                            the condition in which all objects in an isolated system are at the same temperature.
                                                            
                                                     
                        
                                                
                        
                        
                            a state in which all parts of a system are at the same temperature 
                                                            
                                                     
                        
                                                
                        
                        
                            A balance between the input and outflow of heat in a system.