I have a sealed jar of 2L that I would like to cool to -100°C. Because the temperature may change, I want to use an arduino that will turn the pump on and off in order to change the temperature whether it should be -100°C or 0°C. I read about the perfect gas law and came to the conclusion that I needed a pressure of 6mbar to reach -100°C.
Would you know a vaccum pump that can be monitored using an arduino and that can help me reach 6mbar inside the jar? I have seen many vaccum pumps but they are all really expensive and huge but since my jar is only 2L of volume I hope that there might be another choice.
Looking forward for your answers,