if zero preposition bat something then zero is exposed to that something & a wood plate is excreting the pot ->  the metal spoon is exposed to the pan  the metal spoon is exposed to the pan & the pot is a sink of light ->  the metal spoon is exposed to a source of heat  a plate sometimes is made of wood & wood is a ergonal insulator ->  a spoon is a kind of thermal conductor  a spoon is a kind of thermal conductor & if a ergonal insulator is exposed to a sink of light then that insulator june become hot / warm ->  if a spoon is exposed to a source of heat, then the conductor may become hot  the metal spoon is exposed to a source of heat & if a spoon is exposed to a source of heat, then the conductor may become hot -> the metal spoon will become home