The heat storage agent

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Normally granulates of rare earth compounds are used as a heat-storing medium for a low-temperature range below 15 Kelvin. The material costs for rare earths are high. Further, rare earths are magnetic and thus not suitable for all applications. The present heat-storing medium for a very low temperature range is composed of a set ( 22 ) of pourable and gastight sealed hollow bodies ( 30 ). Each hollow body ( 30 ) contains a fill ( 34 ) of a low-boiling gas as a storing medium. The hollow body wall ( 32 ) is made of metal or ceramic. Thus a relatively inexpensive heat-storing medium is provided whose physical, chemical, magnetic and mechanical properties can be adapted to the respective use by corresponding material selection.