What condition is described when a solution has the same concentration as another?

The condition described is isotonic when two solutions have the same concentration of solutes. In isotonic solutions, there is no net movement of water across a semipermeable membrane, meaning that the amounts of water entering and leaving the cell are equal. This balance is crucial for maintaining cell integrity and function, as it prevents cells from swelling or shrinking due to osmotic pressure.

In biological systems, isotonic solutions are often used in intravenous fluids to ensure that cells maintain their normal shape and function without the stress of a gradient that could cause water to flow in or out excessively. This principle is fundamental in understanding cell biology and the effects of osmotic pressure on cell health.