Incomplete. In order for a sentence to be complete it must contain a noun phrase and a verb phrase. Takes in air and floats across a stream are both verb phrases. There needs to be a noun completing the action. The following two examples add noun phrases to complete the sentences.
The dehumidifier takes in air.
The lily pad floats across a stream.
Autumn was very nimble as she skipped from stone to stone across the stream without slipping once.
stream
No, stream is a common noun, a singular, concrete noun. Example sentence:"They threw pebbles at the stream, attempting to make them skip across the water."Stream is a proper noun only when used in the name of something such as Valley Stream NY or Airstream, Inc. Example sentence:"They threw pebbles at the Koasha Stream, attempting to make them skip across the water."Stream is also a verb. Example Sentence:The exiting crowd will stream accross the street so we will need traffic control on duty.
River, stream, waterway, brook, canal, or watercourse
Jet stream is, essentially, high level winds. An example sentence would be: The jet stream was quite concerning to everyone at the station.
The Gulf Stream is a warm ocean current that flows from the Gulf of Mexico up the east coast of the United States and across the Atlantic Ocean. An example sentence could be: "The Gulf Stream influences the climate of coastal areas by bringing warm waters and affecting weather patterns."
a tributary is a stream
The sentence "The dog jumped into the stream" contains a transitive verb ("jumped") because it has a direct object ("stream").
The word stream is both a noun (stream, streams) and a verb (stream, streams, streaming, streamed).The noun stream functions as the subject of a sentence or a clause, and as the object of a verb or a preposition.The verb stream functions as the action of a subject.Examples:The stream felt cool and soothing to our tired feet. (noun, subject of the sentence)We watched the parade stream down the street to the bandstand in the park. (verb, action of the noun parade)
Please be careful when crossing the stream. A stream of light suddenly lit up the whole room.
River, stream, waterway, brook, canal, or watercourse
The winds of a jet stream blow storms.