| abstract |
(57) [Abstract] [PROBLEMS] To provide a medium (water-absorbing polymer) having excellent heat storage and cold storage properties in a small sake bottle, a box, a pot, a pitcher, It is placed around the bottom of a container such as a dish in a state where water is absorbed, and when the container is heated or frozen, the heat stored in the water-absorbing polymer can be used to keep the contents in the container warm and cold A container having a function is provided. A space is formed in a bottom portion forming a container body, A container having a function of cooling and storing heat, wherein a predetermined amount of water and a water-absorbing polymer are accommodated in the space, and a pressure relief valve capable of preventing an increase in pressure in the space is provided. |