Hottest Cities in United States. Two major cities contend for the title of hottest city in the United States. The city that comes out on top depends on how you measure heat. Phoenix Arizona excels at extreme hot weather. It consistently ranks number one for the most days a year when temperatures rise above 89 Â°F or 99 Â°F. Miami challenges Phoenix for top spot on hottest year-round temperatures.
would a chemist most likely study: a leaf changing color in the fall. OR. a leaf floating on water. Follow.
Chemistry is the study of matter and how matter changes. When chemists watch chemicals explode they are actually studying how those chemicals change, into light, sound, and heat specifically, when they are combined. There are five main types of chemistry: physical, analytical, biochemical, organic, and inorganic. The different types focus on different aspects of matter.