What would happend if a flask is put into the container of water?

If a flask is placed into a container of water, it will either float or sink depending on the flask's density relative to the water. If the flask is sealed and contains air, it will likely float due to buoyancy. If it is filled with a denser substance than water, it may sink. Additionally, if the flask is immersed in water, it will experience water pressure on its surface, which may affect its internal contents if not sealed properly.