A carbonated drink is a drink that bubbles and fizzes with carbon dioxide gas. The process by which the gas dissolves in the drink is known as carbonation. This process can occur naturally, such as in naturally carbonated mineral water that absorbs carbon dioxide from the ground, or by man-made processes, as is the case in most soft drinks and soda waters. This involves pumping carbon dioxide into the drink at high pressure, then sealing the container. Since the solubility of carbon dioxide is less at lower pressure, the dissolved gas escapes as bubbles when the container is opened and the pressure is relieved.
The maximum amount of carbon dioxide that can be dissolved in water is 8 g per litre. The excess will normally only remain in water when the drink is under pressure. Once the pressure is released - i.e. when the container is exposed to normal atmospheric pressure - the carbon dioxide will begin to escape. So once a bottle or can of a carbonated drink is opened, the beverage will start to go flat.
Fruit Juice is the liquid extracted from fruit by pressing or macerating the flesh. Probably the most recognizable is orange juice, a breakfast table staple, which is extracted from oranges. Other popular juices include apple, pineapple and grape.
Most countries have a definition of purity to entitle the drink to be classified as a "fruit juice." Within the EU, name of a fruit or fruits used in conjunction with juice is only legally permitted to describe a product that is 100% fruit juice.
Juices are widely available. Some may have been freeze- or spray-dried before being reconstituted; less commonly nowadays they may have been canned. However, fresh juices are increasingly common.
Sports drinks are specifically designed to help people rehydrate after exercise. They are typically used by athletes and those taking part in sport and work by replenishing electrolytes, carbohydrates and other nutrients that can become depleted after exercise.