Argon gas liquefied by cooling in liquid nitrogen and than freezing.
Boiling point of liquid Nitrogen is -195.79 °C
Boiling point of liquid Argon is −185.85 °C
Freezing point of Argon is −189.35 °C
source

Argon gas liquefied by cooling in liquid nitrogen and than freezing.
Boiling point of liquid Nitrogen is -195.79 °C
Boiling point of liquid Argon is −185.85 °C
Freezing point of Argon is −189.35 °C
source
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