By varying the proportions of copper and zinc, the properties of the brass can be changed, allowing hard and soft brasses. The density of brass is approximately .303 lb/cubic inch, 8.4 to 8.73 grams per cubic centimetre.
Both caffeinated and decaffeinated coffee might cause heartburn by encouraging acid production. Other caffeinated drinks, citrus fruit juices, tomato juice and carbonated beverages might trigger your heartburn. Citrus fruit juices include orange, grapefruit, lemon and pineapple. In some cases, these drinks might not cause symptoms because triggers depend on each person.
Vinegar, on the other hand, is acidic, so it is a bit of a surprise that many people find a sip of vinegar either straight or mixed into water is helpful against heartburn discomfort. In this sound clip, a radio show listener reports his experience using apple cider vinegar to alleviate symptoms of heartburn.