Your cafeteria is serving chicken noodle soup today, which it sources from a
distributor and then warms up locally in the kitchen. The soup now sits in a large bowl and
a server uses a large ladle to fill the soup into the smaller bowls handed out to the students.
Consider the following variables:
• Outside temperature.
• Duration that the soup was heated before being put in the bowl.
• Temperature of the soup in a student’s bowl.
• Temperature level to which the soup is warmed up.
• Insulation of the bowl used for storing the soup.
• Duration that the soup bowl is open when the server inserts the ladle to serve a student.
Which of these variables are (a) input variables, (b) output variables, and (c) environmental
variables?
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