- Science
- Grade 7
- Matter and energy
In high school Chemistry, students will be introduced to the concept of standard temperature and pressure (STP). Standard temperature and pressure is defined as 0° C and 1 atm, which is the air pressure at sea level. Changes in temperature and pressure can affect how much solute can dissolve in a solvent. Temperature affects both solid and gaseous solutes, but pressure mostly affects gasses. For example, to make rock candy or rock salt, the solution is heated so that more of the solute dissolves in the solvent. When the solution is cooled, crystals begin to form. In a carbonated beverage, carbon dioxide gas is dissolved at cool temperatures and under pressure. When the top is opened and the beverage warms, carbon dioxide leaves the solution.
Research
Mabbett, Terry. "A different view of the same old grind: great coffee is usually credited to the ideal blend or perfect roast level. However, the step in between beans and brew is often overlooked. The grinding of the beans takes skill, knowledge and expertise, but the results are well worth the effort." Tea & Coffee Trade Journal 179, no.9 (September 2007): Gale General OneFile. https://link.gale.com/apps/doc/A169591141/ITOF?u=txshrpub200873&sid=bookmark-ITOF&xid=e0daaa6c
Summary: " A Different View of The Same Old Grind" uses the grinding of coffee beans to illustrate increasing surface area affecting the rate of dissolution as well as concentration.