How does “freeze-drying” work? (task)
Text
Worksheet:
The task of finding out how freeze-drying works is presented as a contextual scenario.
English, Spanish (CREA), German
2018-03-14
This medium is made available under a CC BY-SA 4.0 international license.
What does this mean?
How to reference this medium
A short story leads to the task’s question; a boy named Daniel is preparing for a camping trip, and it is recommended to him that he take along freeze-dried ready-made meals. He thinks this food is so great that he wants to find out how freeze-drying works. The phase diagram of water is provided to the students to help them solve the task.
Incremental hints for answering this task are available under “How does ‘freeze-drying’ work? (hints for printing)” or “How does ‘freeze-drying’ work? (interactive hints)” on the media portal of the Siemens Stiftung. The worksheet includes QR codes for using the interactive hints online and viewing the solution.
Explanations of the experiment for the teacher are found in “How does ‘freeze-drying’ work? (teacher information).”
Incremental hints for answering this task are available under “How does ‘freeze-drying’ work? (hints for printing)” or “How does ‘freeze-drying’ work? (interactive hints)” on the media portal of the Siemens Stiftung. The worksheet includes QR codes for using the interactive hints online and viewing the solution.
Explanations of the experiment for the teacher are found in “How does ‘freeze-drying’ work? (teacher information).”
Worksheet (printable)
Chemistry; Physics
Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
Middle/high school
Pressure (physics); State of aggregation
Siemens Stiftung Media Portal
Dr. Lutz Stäudel and MediaHouse GmbH
© Siemens Stiftung 2017
