the environments of something can be used to identify that something & a substances boiling point is a kind of physical property ->  a substance 's boiling point can be used to identify the substance  a substance 's boiling point can be used to identify the substance & land is a mean of soccer -> the boiling point of water can be used to identify water the boiling point of water can be used to identify water  the boiling point of water can be used to identify water & land is a mean of soccer & the boiling point of water is 100c -> if a substance has a boiling point of 100c, then that substance is water