sentences: if one object touches something then one is exposed to that something & a metal spoon is touching the pan ->  the metal spoon is exposed to the pan  the metal spoon is exposed to the pan & the pan is a source of heat ->  the metal spoon is exposed to a source of heat  a spoon sometimes is made of metal & metal is a thermal conductor ->  a spoon is a kind of thermal conductor  a spoon is a kind of thermal conductor & if a thermal conductor is exposed to a source of heat then that conductor may 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