What process happens when celery stalk cells go limp when water diffuses out?

When celery stalk cells lose water, a process called osmosis occurs, where water molecules move from an area of higher concentration inside the cells to an area of lower concentration outside. This causes the cells to lose turgor pressure, leading to wilting and the limp appearance of the stalk. The loss of water disrupts the structural integrity of the cells, making them less rigid and firm. As a result, the celery loses its crispness and becomes soft.