Making a thermometer

123456
Across
  1. 2. The liquid inside the bottle. (5)
  2. 5. The coloured liquid moves up this. (5)
  3. 6. This happens to water when it gets warm. (7)
Down
  1. 1. The container used in the experiment. (6)
  2. 3. The object you are making. (11)
  3. 4. Used to seal the bottle. (4)