The boiling temperature of nitrogen is â195.8 Â°C (â320.4 Â°F), about 13 Â°C (â23 Â°F) below that of oxygen, which is therefore left behind. Nitrogen can also be produced on a large scale by burning carbon or hydrocarbons in air and separating the resulting carbon dioxide and water from the residual nitrogen.
Acidic foods like citrus fruits can stimulate acid production and increase heartburn. Avoid oranges, grapefruit, lemons and their juice. Like citrus fruits, tomatoes and products made from tomatoes (tomato sauce and paste, tomato juice) can stimulate the stomach to produce more acid.
Pineapple and Acid Reflux. While most foods are considered acidic, defined by having a pH below 7, pineapple -- with its pH of 3.2 to 4.1 -- is more acidic than many other foods. Historically, the avoidance of high acid foods has been recommended to help control heartburn symptoms.