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"Various Papers" PPT Courseware
How to conduct an experiment to study the water absorbency of paper?
Step 1: Prepare a sink with red ink.
Step 2: Place the glass rods with different paper strips stuck on the sink, and let the ends of the paper strips be immersed in red water at the same time.
Step 3: Pay attention to the rising height of the red water marks on different paper strips.
Step 4: Fill in the observed phenomena on the experiment record card.
Issues that need to be paid attention to when conducting water absorption experiments on paper
The shape of the paper strip is a long strip, with the same width and length.
Be placed in a sink filled with red water at the same time.
Pay attention to the height of the red water marks on the paper.
How to conduct an experiment to study the tensile strength of paper?
method one)
Step 1: Cut the paper into strips of the same size and glue two of them firmly.
Step 2: After drying, hold both ends and pull them to both sides. The one that is broken first will have weaker tensile strength.
Method Two)
Step 1: Cut the paper into strips of the same size.
Step 2: Put two of them together, and then two students hold one end each and pull each other. The one that is broken first has a weaker pulling force.
Method (3)
Step one: Prepare an iron platform.
Step 2: Cut the paper into strips of the same size, glue both ends firmly to make a ring, and put the paper ring on the crossbar of the iron stand.
Step 3: Hook the hook code on the paper ring and see how many hook codes can be hung on each paper ring. The recordkeeper keeps records.
Things to note when using method (3)
The shape of the paper strip is a long strip, with the same width and length.
After hanging up one paper ring, hang the code on the other paper ring.
Today, through experiments, we know that rice paper has strong water absorption, but has low tensile resistance; kraft paper has poor water absorption, but has high tensile resistance. Paper has different characteristics and uses, so we should use it according to our needs in life.
Use paper wisely to avoid waste.
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