Students generate a list of properties a glass of water might have. The class then discusses and categorizes those properties.
We will be spending this course studying thermodynamics, which is the branch of physics that deals with the physical properties of matter and the laws that govern the properties of matter. Today we will be discussing what kinds of properties matter can have.
I am using this activity as the very first content in Energy and Entropy. See Naming and Classifying Thermodynamic Variables for a list of earlier versions of this prompt. The idea is to familiarize students with what sorts of properties are considered in thermodynamics.
The key to this particular activity is that we then discuss which are intensive and which are extensive without yet defining those terms. The idea is that by drinking half of the glass of water we make concrete the "doubling the size" that is often discussed when talking about intensive and extensive properties. This also guides us to the set of properties that are used in bulk thermodynamics, since those properties are either intensive or extensive.
I'd like you all to start by pouring yourself a cup of water. I'll give you a moment to go to your kitchens. Then in your small groups I'd like you to brainstorm a list of all the properties that cup of water might have. Please limit yourselves to properties of the water itself , omitting any properties of the cup or the room around you.
assignment HomeworkEnergy and Entropy 2021 (2 years) The spring constant \(k\) for a one-dimensional spring is defined by: \[F=k(x-x_0).\] Discuss briefly whether each of the variables in this equation is extensive or intensive.
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groups Whole Class Activity
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There are two versions of this activity:
As a whole class activity, the instructor cuts a pumpkin in order to produce a small volume element \(d\tau\), interspersing their work with a sequence of small whiteboard questions. This version of the activity is described here.
As a small group activity, students are given pineapple rounds and pumpkin wedges to explore area volume elements in cylindrical and spherical coordinate systems. In this version of the activity, the fruit is distribued to the students with appropriate children's pumpkin cutting equipment, as part of activities Vector Differential--Curvilinear, Scalar Surface and Volume Elements, or Vector Surface and Volume Elements.
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group Small Group Activity
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