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.
Milk encourages the production of stomach acid and might promote acid reflux in the middle of the night. Raise the head of your bed four to six inches to avoid heartburn during sleep by using blocks under the bedposts. This raises your upper body. Extra pillows only raise your head.
Chronic heartburn is usually from acid reflux - stomach acid is getting past the little valve and into your esophagus. You also should know some natural ways to treat your heartburn. Learn them here. https://tr.im/BestCureHeartburn. The most immediate thing you can do is to stop drinking coffee and cola.