Water Containers: No Oil in this Water Sudoku

Today's Puzzle:

The puzzle plays a lot like the Oil and Water series which I highly recommend you check out if you've not. However, it is a much more approachable variant of it!

Link to Play:

Water Containers by Bert https://tinyurl.com/SudokuSleuthWaterContainer

Rules:

Normal sudoku rules apply.

On a thermometer, digits increase starting from the bulb.

Digits cannot repeat within a cage.

Cages are containers filled with water, air, or both. Water cells and air cells cannot exist in the same row within a container, and air cannot be below water within a container.

The digits 1 to 4 represent air, and 5 to 9 water.