In which of the following scenarios is an open system involved?
(Select all that apply.)
◻ A sealed container of gas undergoing compression
◻ A pot of boiling water on a stove.
◻ A refrigerator maintaining a constant temperature.
◻ A chemical reaction in an open beaker.
◻ A closed thermos containing hot soup.
◻ A car engine running and expelling exhaust gases.