The system is capable of lowering the temperature of the packaging and its content by 17 c within a few minutes. Crown Cork& Seal is developing a self- chilling beverage can in conjunction with tempra technologies.The technology uses the latentheat of water to product the cooling effect. The water is bound in a gel layer coating that coats a separate container within the beverage can.To activate the system, the consumer needs to twist the base of the can to open a valve, which exposed the water to a desiccant held in a separate evacuated external chamber (Anonymous, 2002). This then initiates evaporation of the water at room temperature,and thus achieves a cooling effect as the heat is removed from the system.