text: For a water-filled glass tube in air at  standard conditions for temperature and pressure,  at 20 °C, , and . Because water spreads on clean glass, the effective equilibrium contact angle is approximately zero. For these values, the height of the water column is
  Thus for a  radius glass tube in lab conditions given above, the water would rise an unnoticeable . However, for a  radius tube, the water would rise , and for a  radius tube, the water would rise .
  Capillary action is used by many plants to bring up water from the soil. For tall trees (larger than ~10 m (32 ft)), other processes like osmotic pressure and negative pressures are also important.