An oil bubble 0.1 cm long traveling in a water filledcapillary tube (0.005 cm radius) comes to a restriction only 0.0005cm in radius. If the oil/water surface tension is 20 dynes/cm witha contact angle of 20 degrees, what pressure is required to force the bubble of oil into the restriction? What pressure gradient inpsi/ft is required if 1erg/cm2 = 1.45E-5 psi?