43 109 34manganese nitrate 36 96 28phosphorus 44 112 150rubidium 38 100 44 520magnesium chloride 117 243 40magnesium nitrate 90 194 38glaubers salt 32 90 57sulfur trioxide 50 122 76sodium phosphate 35 94 67white vitriol zinc sulfate 39 102magnesium nitrate hexahydrate 87 190 39eutectic mixture of magnesium 57 135 32nitrate hexahydrate andmagnesium chloride hexahydrate______________________________________ normally an engine will operate in the range between slightly below 100 u00b0 c and ambient temperature during the immediate shut down or 34 hot soak 34 engine temperatures may elevate to even higher than the boiling point of water fig1 shows an idealized relationship between the heat storage medium and normal engine operational temperatures there it is seen that some of the heat which was wasted during engine operation and in the immediate shut down period can be absorbed by the heat storage medium the resulting absorption of heat energy will as illustrated afford significant increases of heat energy during phase change this process of heat absorption is reversible and exhibits the same characteristic changes of heat energy when the heat storage medium is allowed to cool therefore a significant quantity of heat energy which is absorbed during phase change may be returned to the intake manifold upon solidification of the heat storage medium as illustrated in fig1 a change of state heat absorbing material will be a solid when below a particular temperature indicated along the line between points a and b once the temperature reaches the melting point of the material point b it changes to a liquid and experiences an increase of heat energy without temperature increase during the melting process as indicated between.