Gas supply system

A gas supply system that supplies a demander comprising:

• a mixed gas obtained by mixing a first gas generated by vaporization of a first low-temperature liquefied gas and a second gas generated by vaporization of a second low-temperature liquefied gas that is lower in temperature than the first low-temperature liquefied gas;
• a first tank configured to store the first low-temperature liquefied gas;
• a first path into which the first gas generated by vaporization of the first low-temperature liquefied gas in the first tank flows, a gas boosting mechanism configured to boost the first gas being disposed in the first path;
• a second path that is a path configured to extract the first low-temperature liquefied gas from the first tank, a pump configured to boost the first low-temperature liquefied gas and a vaporization mechanism configured to vaporize the first low-temperature liquefied gas boosted by the pump being disposed in the second path;
• and
• a reliquefaction path that is a path configured to liquefy at least part of the first gas extracted from an upstream side of the gas boosting mechanism in the first path and to cause the liquefied first gas to flow into an upstream side of the pump in the second path, a cooling heat exchanger configured to cool the first gas by the second low-temperature liquefied gas or the second gas being disposed in the reliquefaction path.