1.03 cartesian diver instructions for lab PDF

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instructions for lab for cartesian diver...

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8/10/2021

Marine Science

Ocean Exploration Lab—Cartesian Diver Instructions: For this lab, use the lab report to record your information. You will submit your completed lab report.

Introduction Buoyancy is the ability of an object to float. An object that floats is said to be positively buoyant, and one that sinks is negatively buoyant. A Cartesian diver is a classic science experiment used to demonstrate buoyancy. It is named after the French philosopher René Descartes. How does buoyancy work in the ocean? Most boney fishes have a specialized organ called a swim bladder. The swim bladder is filled with gas and allows the fish to control their buoyancy and depth without actively swimming. Scuba divers use weighted systems and buoyancy control devices (such as an inflatable vest). Submarines and other submersibles may use fixed or variable ballasts. (ballast: material that is used to provide stability to a vehicle or structure)

Vocabulary/Definitions Buoyancy: the ability of an object to float in a liquid Mass: a measurement of the amount of matter in an object Density: mass per unit volume of a substance Pressure: a measurement of force per unit area Volume: a measurement of the amount of space an object occupies Review Archimedes' Principle and Pascal's Law

Purpose In this lab, you will explore the effects of pressure on a Cartesian diver.

Materials Empty 2-liter bottle, with cap Ruler or tape measure https://lti.flvsgl.com/flvs-cat-content/5si4svfvn15elrceolcuv12e0d/flvs-cat-session/educator_marinescience_v15_gs/module01/lesson02/pop/cartesian_… 1/3

8/10/2021

Marine Science

Small bowl Water Cartesian diver. There are a few easy ways to make one: Option 1: ketchup or soy sauce condiment packet Option 2: medicine dropper Option 3: pen cap and modeling clay or silly putty If you are unable to find suitable materials or cannot otherwise complete the hands-on lab, view this lab alternative version.

Procedure 1. Fill the bowl about halfway with water. The first step will be making a Cartesian diver that just barely floats. If you used Option 1: The ketchup or soy sauce condiment packet: test out a few packets to find one that just barely floats by a corner. A paper clip may be used to weigh it down if needed. Option 2: A medicine dropper: partially fill the dropper with water, so that it just slightly floats. Option 3: A pen cap and modeling clay or silly putty: use the clay or putty to trap air inside the pen cap and close the open side. You may have to experiment a bit with how much clay or putty to use to make the pen cap float. 2. Fill the 2-liter bottle to the top with water, and gently place your Cartesian diver inside. Put the cap back on tightly. 3. Make your hypothesis and identify the variables, and record them on your lab report. You will be applying pressure to the bottle and observing the effects on the diver. According to Pascal's law, this pressure will be evenly distributed in the liquid. What will happen to the diver? If the pressure increases, then the diver will _____ (sink/float). Remember that the independent variable is the factor that you manipulate, and the dependent variable is what changes as a result. 4. Hold the ruler or tape measure showing the centimeters, and place the 0 centimeter mark at the top of the water column. This way you can to measure from top of diver how deep your diver goes in centimeters. You can use a marker to mark the bottle or take notes in your lab report as you go. Squeeze the bottle to apply pressure and observe the diver. Release the pressure on the bottle and observe the diver. Try squeezing with different amount of pressure. Record your data on your lab report about your observations and the centimeter mark that the top of the diver reaches each time. 5. Once you have made enough observations, clean up your lab materials and answer the Conclusion questions on your lab report. Please write in complete sentences. https://lti.flvsgl.com/flvs-cat-content/5si4svfvn15elrceolcuv12e0d/flvs-cat-session/educator_marinescience_v15_gs/module01/lesson02/pop/cartesian_… 2/3

8/10/2021

Marine Science

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