Question

describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature​

Answer 1

Set up an apparatus with a boiling beaker and a burner with a thermometer in the beaker. Boil water in the beaker taking note of the thermometer. It is observed that after a certain temperature (usually 100°C) the reading stops progressing. This shows that since the heat is still being supplied to the water, the temperature isn't increasing anymore, so water must be observing the heat, which is exactly what happens in form of latent heat.

Answer 2

to prove that water..... temperature

evaporation

evaporation takes place under room temperature . it takes place at surface area thus when you keep a cap of water it will take time whereas when you keep the same in a saucer it will dry in a second . it's easy peasy or simply follow the boiling method.
take a beaker and fill water in it heat it at boiling point I.e.100 ° c.hence proves water absorbs heat.