two-part experiment

noun
UK /ˌtuː ˈpɑːt ɪkˈsperɪmənt/
US /ˌtu ˈpɑːrt ɪkˈsperɪmənt/

A test done in two steps to see what happens.

We did a two-part experiment to see which paper towel holds more water.


OTHER MEANINGS

2. A scientific study carried out in two separate stages.

The two-part experiment first measured the plant's growth, then tested different soils.

3. A school activity where you try something in two steps.

Our two-part experiment had a mixing step and a watching step.

4. A test with a first part and a second part that go together.

The two-part experiment showed that the balloon got bigger in part two.