A pressure associated with this process is a colligative ("co-LIG-uh-tiv") property proportional to mass and temperature, and is defined as the hydrostatic ("HY-dro-STAT-ick") pressure necessary to counteract this process. A "reverse" form of this process is sometimes used to purify water. For 10 points, name this movement 
A pressure associated with this process is a colligative ("co-LIG-uh-tiv") property proportional to mass and temperature, and is defined as the hydrostatic ("HY-dro-STAT-ick") pressure necessary to counteract this process. A "reverse" form of this process is sometimes used to purify water. For 10 points, name this movement of water across a semi-permeable membrane from an area of high concentration to an area of low concentration.
A pressure associated with this process is a colligative ("co-LIG-uh-tiv") property proportional to mass and temperature, and is defined as the hydrostatic ("HY-dro-STAT-ick") pressure necessary to counteract this process.
{osmosis} [prompt on diffusion]