Elemental potassium is a soft silvery-white alkali metal that oxidizes rapidly in air and reacts vigorously with water, generating sufficient heat to ignite hydrogen emitted in the reaction and burning with a lilac flame.
An antianginal is any drug used in the treatment of angina pectoris, a symptom of ischaemic heart disease.
Angina, or angina pectoris, is a medical term for the symptoms caused by the heart not getting enough oxygen from the arteries that supply the heart with blood. When these arteries become narrowed or blocked over time, it is called coronary artery disease (CAD) , and it can cause angina. Most commonly, people describe their symptoms of angina as chest discomfort or pain. Angina can be stable or unstable. When angina becomes unstable, it is commonly associated with a heart attack, which is a medical emergency. Stable angina is not usually an emergency, but it can be painful and frightening.