There is evaporation, condensation, precipitation,
<span>Human factors psychology is the study of how workers interact with the tools of work and how to design those tools to optimize workers' productivity, safety, and health.Such psychologists study how people interact with machines and technology.Tjey use psychical science to guide the design of products, systems and devices.</span>
Animals are used in experiments because they have somewhat similar structures as humans so they can gauge a human's reaction to something.
Also because the animals can't say no. :(