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Measuring Open Space in a Model Grain Bed 4 questions
Measuring Open Space in a Model Grain Bed
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A class compares two beds made from equal masses of the same solid grains. One bed is loosely packed and the other is pressed together. Water can fill the gaps between the grains but cannot enter the grains. The displacement reading counts the space that the water cannot occupy.
| Bed | Outside volume (mL) | Water displaced by grains (mL) |
|---|---|---|
| Loose | 50 | 24 |
| Pressed | 40 | 24 |
Question 1
Calculate the volume of the open gaps in each bed. Use both measurements.
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Question 2
Which comparison fits the data after pressing?
- The pressed bed has less grain material.
- The pressed bed has less open space between grains.
- The pressed bed gains 10 mL of solid.
- Pressing increases both measured volumes.
A second material has grains with tiny sealed air spaces inside them. Water still fills the gaps between grains, but it cannot enter the sealed spaces.
Question 3
Explain why water displacement for the second material would include the sealed spaces as well as the solid grain material.
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Question 4
Describe how the class could check whether pressing a new bed changes only its open gaps. State the two readings to compare before and after pressing.
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