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Why blackboard called blackboard instead it calledgreen board?
The term "blackboard" originates from the traditional color of the writing surface, which is typically black or dark gray. This color allowed for high contrast with white or colored chalk, making it easier to read from a distance. While modern boards can be green or other colors, the name "blackboard" has persisted due to historical conventions. The green board, often referred to as "greenboard," is just a variation that became popular later.
Who uses a blackboard and chalk?
I am pretty sure it's a teacher.
What is the attraction between unlike molecules such as chalk and blackboard?
The attraction between unlike molecules, such as chalk and a blackboard, is primarily due to electrostatic forces. When chalk is rubbed on a blackboard, it can create a transfer of electrons, leading to the buildup of static charges. This charge difference generates an attractive force between the two surfaces, allowing the chalk to adhere to the blackboard. Additionally, van der Waals forces may also play a role in the interaction between these materials.
How long does it take for water to evaporate on a blackboard?
This depends on many factors.
Explain Why blackboards are not scratched by chalk but by the sand embedded in the chalk?
Blackboards are typically made of a material that is softer than chalk, such as slate or porcelain. When you write on a blackboard with chalk, the friction between the chalk and the board causes the chalk to wear down and leave behind tiny particles of sand or abrasive material embedded in the chalk. These abrasive particles then scratch the surface of the blackboard as you write, creating marks that can be difficult to erase.
What was the inventor of the blackboard like?
The guys name is James Pillans. He invented this piece in 1801 and called it the blackboard. In the 1930s the name "chalkboard" was introduced. The blackboard is mostly for teaching. It has different variaties of colers,such as black,green,and brown.
What is clean when black and dirty when white?
Blackboard
How can you describe a blackboard?
a black board
What is blackboard called in Hindi?
Blackboard is called "काली बोर्ड" (kali board) in Hindi.
What is a compound word for black?
blacksmith
What is white when dirty and black is clean?
A blackboard
What black when its clean but white when dirty?
Blackboard
What is white when it's dirty and black it's clean?
A blackboard seems to fit.
What is blackboard in Hindi?
Blackboard in Hindi is called "काला बोर्ड" (kaala board).
When to use blackboard in a sentence?
i wrote on a black bored
iam white when I am dirty, and black when I am clean. What am I?
A blackboard.
What is a blackboard stand called?
unsil
