Anderer Ressourcentyp

Siemens Stiftung

Can wet towels reduce heat? (teacher information)

Teaching methods:
Teaching methods for teachers on the worksheet of the same name

The task is related to the energy balance during the transition between the states of aggregation, and it specifically addresses the cooling of indoor air through the evaporation of water from damp towels.
Degree of difficulty of the task: low to medium.
The teaching methods provide teachers with all the important information on using the worksheet of the same name and the related incremental hints in class. The scientific background on the task and possible variations are provided.
The six incremental hints for the task are provided with their answers. They are also available as a separate ready-to-print medium named "Can wet towels reduce heat? (hints)? on the media portal of the Siemens Stiftung.

Anderer Ressourcentyp

Siemens Stiftung

A4 Evaporation heat - How to cool with heat (worksheet 1 answer sheet)

Answer sheet:
For the worksheet of the same name for subject teaching in English.

You can find more detailed information on the associated worksheet for subject teaching in English "A4 Evaporation heat - How to cool with heat (worksheet 1),? which is available on the media portal of the Siemens Stiftung.


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

B1 Water cycle (worksheet 2 answer sheet)

Answer sheet:
For the worksheet of the same name for subject teaching in English.


You can find more detailed information on the associated worksheet for subject teaching in English "B1 Water cycle (worksheet 2),? which is available on the media portal of the Siemens Stiftung.


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

A4 Evaporation heat (answer sheet)

Answer sheet:
For the student experimentation instructions of the same name.

The answer sheet contains sample answers to all questions asked in the student experimentation instructions. In some cases, the answers are very short, often only in the form of key words. Depending on the learning objective, they can be augmented and enlarged upon with additional material from textbooks or Internet research.
Likewise, the answer sheet will be elaborate on the analyses for the individual subexperiments, but only in cases where experience shows that there could be difficulties.

You will find more detailed information in the related experimentation instructions "A4 Evaporation heat (student instructions)", which are available on the media portal of the Siemens Stiftung.

Arbeitsblatt

Siemens Stiftung

Why does a dog pant? (task)

Worksheet:
Why do dogs pant on hot days or during exertion? Task with a contextual scenario.


A short story leads to the task?s question; it is hot, and when Ronja takes the dog for a walk, the dog breathes quickly and its tongue hangs way out. Ronja is concerned. The students should then answer the question: Why does a dog pant?

Incremental hints for answering this task are available under "Why does a dog pant? (hints)? on the media portal of the Siemens Stiftung.
Explanations of the experiment for the teacher are found in "Why does a dog pant? (teacher information).?

Medientypen

Arbeitsblatt

Lernalter

11-18

Schlüsselwörter

Evaporation

Sprachen

Englisch

Arbeitsblatt

Siemens Stiftung

Not all shade is the same (task)

Worksheet:
On hot days, why is it cooler in the shade of a tree with a thick canopy of leaves than under a patio umbrella? Task with a contextual scenario.

A short story leads to the task?s question. The students should explain why it is cooler in the shade of a tree with a thick canopy of leaves than under a patio umbrella covered with fabric. The question can be answered based on the energy balance during the transition between the states of aggregation; in this example, the transition is the evaporation of water from the leaves of a plant.

Incremental hints for answering this task are available under "Not all shade is the same (hints)? on the media portal of the Siemens Stiftung.
Explanations of the experiment for the teacher are found in "Not all shade is the same (teacher information).?

Bild

Siemens Stiftung

Principle of a clay cooler

Schematic diagram:
The evaporation process on the surface of a ceramic cooler is shown schematically.

The ceramic cooler made of fired clay was soaked in cold water and then removed. The pores of the ceramic filled up with water. If a cold beverage bottle is then placed inside, it will stay cold for a relatively long time in the ceramic cooler, even if the surrounding temperature is higher. As the water evaporates from the pores of the ceramic cooler, heat is constantly extracted from the air in the interior of the clay pot (evaporation heat and some adsorption heat). As a result, the air inside the clay pot stays cold, as does the bottle placed inside.

Arbeitsblatt

Siemens Stiftung

B1 Water cycle (worksheet 2)

Worksheet for subject teaching in English:
For the student experimentation instructions of the same name. Methodology tool: picture sequence developed by Josef Leisen and Heinz Klippert.


Note: This worksheet has been developed especially for subject teaching in English and for language-sensitive subject teaching. It uses the picture sequence methodology tool developed by Josef Leisen and Heinz Klippert. The picture sequence is used to train students how to correctly comprehend and then explain the chronological and logical sequences of events.
Students whose native language is not English and who do not have strong English skills receive support and training in understanding the technical vocabulary. They work with the specialized vocabulary and in this way acquire the ability to communicate about specific subjects.


Dieses Material ist Teil einer Sammlung

Experiment

Siemens Stiftung

A4 Evaporation heat (student instructions)

Experimentation instructions for Experimento | 10+:
Detailed instructions and questions for students on conducting the experiment "Evaporation heat - How to cool with heat". This experiment comprises two subexperiments.


The experiment comprises two subexperiments:
· Why do you freeze in wet clothing?
· How does a wet cotton pad cool you?

For each subexperiment, the students are first provided with an overview of the materials to be used and safety information. This overview is followed by the detailed, step-by-step instructions for conducting the experiment. Afterwards, the students are asked to note their observations. Specific questions are used to guide the students as they analyze the results of the experiments. At the end, the students are asked probing questions related to the experiment (an answer sheet is available for teachers).

Notes:
· Observe the safety information in the instructions as well as the applicable safety guidelines for your school and discuss it with your students.
· This student instruction is also available in Word format (doc-file).

Anderer Ressourcentyp

Siemens Stiftung

Can wet towels reduce heat? (hints, version without experiment)

Incremental hints:
The five hints and answers for the worksheet of the same name (version without experiment) prepared for printing. The last hint presents the complete solution.

Working with incremental hints allows weaker students to develop a solution independently, helping them gain a sense of achievement and experience learning success. The document provides assistance related to the content and learning strategy for solving the task from the worksheet of the same name.

Information and ideas:
The students who did not use the hints to solve the task should also read the last hint with the complete solution to compare their results.
The hints in the prepared tasks have been designed so that they can be printed double-sided. Additional information on how the hints are used is compiled in the teaching methods named "Tasks with incremental hints - An introduction? that are available on the media portal.