Interdependence. Interdependence is a key idea in science. As students learn about science, they begin to understand that the earth is not a group of discrete parts but a continuous environment existing over time as well as place.
In order to remove the caffeine from coffee beans, the beans are washed in a solvent (a liquid capable of dissolving substances), transferring the caffeine from bean to liquid in a process known as extraction. To extract caffeine from whole coffee beans, the following solvents can be used:
Instant coffee. Instant â or soluble â coffee is made from coffee beans that have been roasted and ground. The ground beans are then extracted with hot water to recover the coffee flavour and aroma. The process is similar to using a coffee percolator at home. The coffee extract is then dried in one of two ways: Spray-drying. In spray-drying the coffee extract is sprayed into a stream of hot air at the top of a tall cylindrical tower. As the droplets fall, they dry, becoming a fine powder by the time they reach the bottom. The powder may then be texturised into granules to facilitate dosage and dissolution.