Bile is an alkaline viscous fluid, yellow to green in colour and having a pH of 7.8‐8.6. Saliva is secreted by salivary gland and its pH is about 6.8. Gastric juice is secreted by the gastric gland in stomach and its pH value is 1‐2.5 and pancreatic juice is colourless watery fluid and slightly alkaline. Its pH is 7.5‐8.0. Therefore gastric juice has minimum pH value.