the most common characteristics of a solid and a liquid along with examples that fall under each category.


Classifying material as either solids, liquids, or gasses is not always simple. In this module’s essay, you will be exploring this concept and the limitations of categorizing various materials.

Case Assignment

In a 1½- to 2-page essay, address each of the following topics:

· Classification helps us categorize different substances based on a set of characteristics. Define the most common characteristics of a solid and a liquid along with examples that fall under each category.

· What are the limitations to categorizing substances in only 3 categories? How is it useful?

· Provide at least two example substances found outside these 3 categories and explain why they are difficult to place in either the liquid, solid, or gas category.

Assignment Expectations

Organize this essay assignment using subtitles that summarize each topic.

Be sure to use APA formatting throughout your essay with 1-inch margins, 12-point type, and double spacing throughout. Include a title page, introduction, discussion of topics with subtitles, and concluding paragraph. Remember to include in-text citations within the body of the essay referencing your resources (e.g., Murray, 2014). Also, be sure to include a reference section at the end of your assignment listing all required readings and any resources you used to complete your essay (your essay should have a minimum of three). See the Trident guide to  .

Direct quotes should be limited and must be designated by quotation marks. Paraphrased ideas must give credit to the original author, for example: (Murray, 2014). Direct copying from “homework help” websites will not receive credit. Once you have completed your assignment within a Word document, upload your final version to the Case 2 Dropbox, note your Turnitin originality score, and make revisions as needed. Contact your instructor with any questions.

Classification helps us categorize different substances based on a set of characteristics. Define the most common characteristics of a solid and a liquid along with examples that fall under each category.


Classification is the process of categorizing objects into groups. It helps us organize information, make decisions and solve problems. Classification can be based on anything from race to species and everything in between. The most common form of classification used today is called taxonomy (a Greek word meaning order), which classifies things based on attributes like color or size while also taking into consideration other characteristics such as function or behavior.


A solid is a substance that has a definite shape, size and volume. The term solid also refers to its three dimensional structure, as opposed to liquid or gas. The melting point of a solid determines when it can be converted from one state into another by heating it up until it melts or turns into a liquid (when heated beyond its melting point). This can be done by placing the solid in an oven or simply applying heat through another means such as friction between two objects—for example if you were to rub your hands together repeatedly while holding onto something that contained ice cubes then those ice cubes would melt because they were heated up quickly enough for them not only become liquid but also lose their shape completely after being exposed long enough at room temperature conditions.”


Liquids are substances that flow and take the shape of their containers. They have a definite volume, but no definite shape. Liquids can be divided into two categories: gases and liquids.

For example, water is a liquid because it flows freely when poured into its container (the glass). It also has a certain amount of weight per unit area; this means that if you pour 1/2 cup of water into another glass with 1/2 cup capacity, then after some time the total amount will be 2 cups (1 + 1). You cannot divide these two glasses equally because there isn’t enough space between them for an equal amount of liquid to fill each one completely before overflowing onto the sides or bottom surfaces due to gravity pulling down on top surfaces in order for them not fall over unexpectedly later when handled carelessly by someone else who may not know what they’re doing!


  • A gas is a substance that does not have definite shape or volume, and therefore cannot be compressed.
  • Gases are defined as the state of matter in which matter exists as a fluid under pressure.
  • Gases are compressible substances, meaning that they can be squeezed together into smaller areas (like when you squeeze toothpaste).
  • Gases also do not conduct heat well; they don’t conduct electricity well either. This means that gases aren’t good at conducting heat away from their source very easily, nor do they reflect light well at all!

Classification helps us categorize different substances based on a set of characteristics.

Solids are substances that have a definite shape and volume. They also do not flow or change shape easily. In other words, they are generally hard and not brittle. Examples of solids include rocks, glass and wood.

For example: A rock is a solid because it has no holes in it; it’s always the same size; its shape doesn’t change when you hit it with your hands (like when you throw a rock into water); if you put two rocks together they won’t move around much either because there aren’t any air spaces between them; if you touch them at all points where there should be no contact between two objects then nothing happens between those points!


The key takeaway from this exercise is that there are lots of different ways to classify objects. The most common way is by using a fixed set of characteristics and then applying them over and over again. But there are always exceptions, so it’s important to be aware of these when making judgments about whether or not something belongs in a category.

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