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Copyright (c) 2006-2014 MindTouch Inc.
This file and accompanying files are licensed under the MindTouch Master Subscription Agreement (MSA).
At any time, you shall not, directly or indirectly: (i) sublicense, resell, rent, lease, distribute, market, commercialize or otherwise transfer rights or usage to: (a) the Software, (b) any modified version or derivative work of the Software created by you or for you, or (c) MindTouch Open Source (which includes all non-supported versions of MindTouch-developed software), for any purpose including timesharing or service bureau purposes; (ii) remove or alter any copyright, trademark or proprietary notice in the Software; (iii) transfer, use or export the Software in violation of any applicable laws or regulations of any government or governmental agency; (iv) use or run on any of your hardware, or have deployed for use, any production version of MindTouch Open Source; (v) use any of the Support Services, Error corrections, Updates or Upgrades, for the MindTouch Open Source software or for any Server for which Support Services are not then purchased as provided hereunder; or (vi) reverse engineer, decompile or modify any encrypted or encoded portion of the Software.
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Through a variety of different procedures, determine whether the corn starch and water solution that the beaker contains is a solid or a liquid. For example:
When pressure is applied to this solution, it exhibits the properties of a solid. When the pressure is released, it exhibits the properties of a liquid. The starch granules reversibly absorb and release water depending upon the external pressure applied. Because the mixture should look like a liquid when properly made, the confusion over whether or not to call it a solid or liquid is only amplified.
It should be noted that creating this ambiguous solution can be rather tricky. Adding too little cornstarch will provide the properties of a liquid, and adding too much will provide the properties of a solid. The middle ground is difficult to obtain, so care should be taken during the preparation.
This demonstration has been used in the past to make students realize that some solids and liquids are difficult to classify as one or the other.
An NSF funded Project