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Although rumors suggest that pencils used to be made from pure lead, this is a myth. Pencils have always been made of graphite since the mineral's discovery in 1565. The pencil hadn't taken on it's true "form" until 1660 when they were made as graphite rods encased with wood as we know them today. The only main difference is in the graphite mixture. Today our pencils are made with a mixture of graphite and clay to create dark marks such as those of number two pencils or HB (hard, bold) marks.
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∙ 14y ago
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How has the pencil changed over time?
IT hasn't
Could you have always made a pencil or did something change that allows us to make and use it?
Yes, we could have always made a pencil as long as the right resources are there. Though the pencil design has changed over time, the material that the pencil is made of has not changed.
Why is sharpening a pencil a physical change?
Because the pencil is made of wood and you only changed the size and shape of the wood or pencil and did not change what the wood is made of the substance
Is breaking your pencil physical or chemical?
First off, its spelled "breaking". No, Its a physical change, because the pencil hasn't changed its chemical components, all you did was ruin a pencil. :)
How have computer changed your world?
Instead of writing my essays in paper and pencil and ca type them and print them out. It has made me more lazy.
Why is erasing a pencil mark a physical or chemical change?
PHYSICAL
Why is shadowing a pencil different type of physical change than freezing water to ice?
In the first case the state of matter is not changed.
What are the differences between rotating and non rotating black holes?
1). Stick a pencil into the object. Make a note of the direction in which the end of the pencil is pointing. Go away for a while. Come back after some time has passed. Make note of the direction in which the pencil is pointing now. If the direction in which the pencil points has not changed, then the object most likely is not rotating. Go to section 2.If the direction of the pencil has changed, and the object has not been disturbed since your first observation, then the object is rotating.2). If the direction of the pencil has not changed, remove the pencil, and stick it into a slightly different place on the object. Repeat the test, using a slightly different interval of time between observations. If the pencil again does not change the direction in which it points, then the object is not rotating.(Second test-run eliminates the possibility that the pencil was originally stuck into a pole of rotation, and the possibility that interval between observations could have been exactly a whole number of periods after the first one.)
Can you change blades in model 18 pencil sharpener?
You can physically change the blade but unfortunately no one sells the part. But to strictly answer your question; Yes, it can be changed.
What color is laurentian pencil crayon number twenty one?
It used to be called Indian Red but they changed it to Roan Red to be more politically sensitive.
What am i i am usually as long as a new pencil To write my name you meed three words?
"A new pencil"."A new pencil"."A new pencil"."A new pencil".
What is an object that is exactly 5 inches long?
is it a pencil.
