Astronic pressure is the pressure that needs to be applied to a membrane to stop the flow of solvent into an area of a higher solid concentration. So whenever we talk about an ideal solution that has a very low solid concentration, we can find osmotic pressure on one side of the equation or on one side of the membrane by using this formula. And this formula states that osmotic pressure is equal to Bonhopper, which is the number of particles a single molecule or a single site molecule breaks into times molarity of our solution times the gas constant or r times temperature in Kelvin. Now, now that we talk about osmotic pressure, we also talk about osmotic potential. Now, any pure substance, such as pure water, is automatically given an asthmatic potential of zero and any impure substance. So if we add a solution to water, we give it an asthmatic potential of less than deer, so it has a negative asthmatic potential.