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Cover one ear with your hand and the other ear with the bag of air. Have an assisstant tap the bag with a pencil. How does it sound? Now fill the bag with water (a liquid) and seal it. Hold this water-filled bag against one ear while covering the other ear with your hand. Have your assistant tap this bag with a pencil.
Mike Blaber ( Florida State University) 11.1: A Molecular Comparison of Gases, Liquids, and Solids is shared under a license and was authored, remixed, and/or curated by LibreTexts. The state of a substance depends on the balance between the kinetic energy of the individual particles (molecules or atoms) and the intermolecular forces.
The sound speed of a water-air mixture depends on the pressure, the void or mass fraction of air, the frequency of the sound wave, and, if surface tension effects are included, on bubble radius. The admixture of small volume fractions of air causes a dramatic lowering of the sound speed by nearly 3 orders of magnitude.
A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid. (Think about a diving tank – 600 L of gas is compressed into a 3 L cylinder.) Right now, you are breathing in air – a mixture of gases containing many elements such as oxygen and nitrogen.
Jul 26, 2023 · A hands-on exploration of states of matter, suitable for ages 8–10; grades 3–5. Many Kinds of Matter (A Look at Solids, Liquids, and Gases) by Jennifer Boothroyd. Lerner, 2010. A very simple 32-page outline for ages 6–9, grades 1–3. It covers the basic states and changing between them, with clear, real-world examples.
The sound moves through a medium by alternately contracting and expanding parts of the medium it is travelling through. In physics, the sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. Read More: Forms of Energy. Watch the video and learn about the fundamentals of sound
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