Watch water boil at room temperature. The temperature at which water boils depends on pressure. You can demonstrate this by dramatically lowering the pressure on a water-filled plastic syringe at room temperature.
Students learn about and experiment with the concept of surface tension. How can a paper clip "float" on top of water? How can a paper boat be powered by soap in water? How do water striders "walk" on top of water? Why do engineers care about surface tension? Students answer these questions as they investigate surface tension and surfactants.
In this demonstration of chemical change, the presenter blows breath into a methylene blue solution releasing carbon dioxide which acidifies the water and changes it from a bright blue color to green.
Students work in groups to create soap bubbles on a smooth surface, recording their observations from which they formulate theories to explain what they see (color swirls on the bubble surfaces caused by refraction). Then they apply this theory to thin films in general, including porous films used in biosensors, listing factors that could change the color(s) that become visible to the naked eye, and learn how those factors can be manipulated to give information on gene detection. Finally (by experimentation or video), students see what happens when water is dropped onto the surface of a Bragg mirror.
This activity is a lab project where students observe what happens when you try to mix oil and water. It can also be used to work with density.
Students learn a simple technique for quantifying the amount of photosynthesis that occurs in a given period of time, using a common water plant (Elodea). They can use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. Before they begin the experiment, however, students must come up with a well-worded hypothesis to be tested. After running the experiment, students pool their data to get a large sample size, determine the measures of central tendency of the class data, and then graph and interpret the results.
A new instructional model, called Argument-Driven Inquiry (ADI), is introduced to elementary teachers in this article. The author shows how school librarians and classroom teachers can collaborate to help students construct and communicate evidence, or arguments. Evidence buckets, a collaborative activity, and related online resources are presented. The article appears in the free online magazine Beyond Weather and the Water Cycle, which is structured around the seven essential principles of climate literacy.
This art history video discussion examines the Buddha of Medicine Bhaishajyaguru (Yaoshi fo), c. 1319, Yuan dynasty, water-based pigments on clay mixed with straw, 24 feet, 8 inches x 49 feet 7 inches / 751.8 cm x 1511.3 cm (Metropolitan Museum of Art, New York).
Bring the rainforest to life in your classroom! Give your students hands-on experiences that will build their understanding of the importance of tropical rainforests and the need for protecting these valuable ecosystems. Explore topics including the water cycle in the Amazon, the life cycle of rainforest plants, rainforest conservation challenges, and more. You can use this kit to prepare your students for a field trip to the Academy's Rainforest Exhibit. Or, if you can't make it to the Academy, use the kit on its own to bring the rainforest to you! This version of the rainforest kit is for grades 4 - 8.
Lab 1: the students begin by describing on a worksheet their own ideas
of delta formation using concept sketches and written descriptions of
the stages of formation, with only broad guidance from the instructor.
They are also asked to describe the key features of their concept
sketches, and to hypothesize how those features might develop (the
processes). The students have all been exposed to deltas in Physical
Geology, but likely only have rudimentary knowledge of them. Once they
have completed the worksheet, the entire class moves to a lab with a
stream table in it, preset to run a "model delta." The model has both a
web cam and a time-lapse web cam set up over the table to record the
development. The students help start the water flowing and the cameras
recording, then watch as it develops over the next 2-3 days.
Lab 2: In the second lab, we use grain-size analysis of the
stream-table delta as a means of testing some of their ideas from lab
1. The students as a class develop a strategy to sample the
stream-table delta for grain size, using a laser grain-size analyzer.
Each pair of students collect one sample, but are also asked to predict
the changes in grain size distribution for samples elsewhere in the
delta. The particle size analyzer rapidly provides results to the
students near the end of lab.
Lab 3: the final lab is a field trip to a pair of gravel pits that
expose the guts of two natural stranded deltas, including topset and
foreset beds. The students are asked to assess the landforms on a topo
map before arriving, and to describe the deposits at each site we
visit. On the final writeup, the students need to synthesize all the
elements of the three labs, along with input from our readings in the
textbook (Easterbrook) and McPhee's "Control of Nature."Â
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When an object is placed in water, there are two primary forces acting on it. Buoyancy is the force exerted on an object that is wholly or partly immersed in a fluid. The force of gravity is a downward force and buoyancy is an upward force. The gravitational force is determined by the object's weight, and the buoyancy force is determined by the weight of the water that is displaced by the object. If an object weighs less than the amount of water it displaces, it floats; if it weighs more, it sinks.
Student groups construct simple conductivity probes and then integrate them into two different circuits to test the probe behavior in solutions of varying conductivity (salt water, sugar water, distilled water, tap water). The activity culminates with student-designed experiments that utilize the constructed probes. The focus is to introduce students to the fabrication of the probe and expose them to two different ways to integrate the probe to obtain qualitative and quantitative measurements, while considering the application and utility of a conductivity probe within an engineering context. A provided handout guides teams through the process: background reading and questions; probe fabrication including soldering; probe testing and data gathering (including circuit creation on breadboard); probe connection to Arduino (including circuit creation and code entry) and a second round of testing and data gathering; design and conduct their own lab experiments that use the probes; online electrolyte/nonelectrolyte reading, short video, comprehension check and analysis questions.
This course covers examination of the state of knowledge of planetary formation, beginning with planetary nebulas and continuing through accretion (from gas, to dust, to planetesimals, to planetary embryos, to planets). It also includes processes of planetary differentiation, crust formation, atmospheric degassing, and surface water condensation. This course has integrated discussions of compositional and physical processes, based upon observations from our solar system and from exoplanets. Focus on terrestrial (rocky and metallic) planets, though more volatile-rich bodies are also examined.
In this video segment from ZOOM, Jillian explains how her simple machine uses marbles, levers, flowing sand, and a spinning wheel to water a plant.
In this video segment from PEEP and the Big Wide World, children make a dam with dirt, sticks, and stones to try to stop the flow of water.
This is a hands-on activity to assess the students understanding of peptide and disulfide bonds formed during protein synthesis. Students demonstrate the process of dehydration synthesis by combining amino acids through peptide bonds creating molecules of water, and one protein amino acid strand. It can also be used to assess students understanding of the process of translation.
How do you build a tunnel 32 miles long -- under water? This video segment adapted from Building Big, follows the construction of the Channel Tunnel (nicknamed "Chunnel"), the engineering wonder that connects England to France.
In this activity, the students test the shelters they built in Lesson 3, Activity 1 for durability and water resistance.
This unit consists of five lessons covering buoyancy and engineering boats. Each lesson includes goals, anticipatory set, learner objectives, guided practice, procedure instructions, closing activities, and extensions. Student handouts and worksheets are also included.
Lesson 1: Intro to Buoyancy
Lesson 2: Engineer a Barge
Lesson 3: Intro to Sails & Motion
Lesson 4: Engineer a Sailboat
Lesson 5: Final Vessel
NGSS: 3-5-ETS1-1, 3-5-ETS1-2, 3-5-ETS1-3
Lesson 1 materials: empty 2-liter bottles with tops cut off, pennies or other coins, marble, modeling clay, crap wood, rocks, pingpong ball, golf ball, popsicle stick, paper clip, scale, other object for floating or sinking
Lesson 2 materials: for each student - 12" x 12" piece of aluminum foil, 4 popsicle sticks, 2 straws, 12" masking tape; teacher pre-setup - enough pennies for testing (500 pennies per group), pool filled 2/3 with water
Lesson 3 materials: string/yarn, 1/2 straw for each student, 2 different types of paper (tissue & white copy paper), tape, scissors, fan, wooden skewers, 2 popsicle sticks per student, rulers, protractors, stencils.
Lesson 4 materials: 8 popsicle sticks, 1 wooden skewer, 1 straw, masking tape or duct tape, tissue paper or copy paper
Lesson 5 materials: same as Lesson 2
Students conduct a simple experiment to see how the water level changes in a beaker when a lump of clay sinks in the water and when the same lump of clay is shaped into a bowl that floats in the water. They notice that the floating clay displaces more water than the sinking clay does, perhaps a surprising result. Then they determine the mass of water that is displaced when the clay floats in the water. A comparison of this mass to the mass of the clay itself reveals that they are approximately the same.