Absorb, absorption:

1.to take in or make part of an existing whole.

2.

To recover liquid hydrocarbons from natural or refinery gas in a gas-absorption plant.

The wet gas enters the absorber at the bottom and rises to the top, encountering a stream of absorption oil (a light oil) traveling downward over bubble-cap trays, valve trays, or sieve trays.

The light oil removes, or absorbs, the heavier liquid hydrocarbons from the wet gas.

3.

To soak up as a sponge takes water.