Full Form of HB:

Explanation:
HB stands for "Hard Black" in the context of pencils. It is a standardized scale used to measure the hardness of the pencil lead, which in turn determines the darkness of the mark it makes on paper.

Hardness Scale:
The HB scale ranges from 9H (hardest) to 9B (softest), with HB being in the middle. The higher the number before the H, the harder the lead, while the higher the number before the B, the softer the lead.

HB Pencils:
HB pencils are considered to have a good balance between hardness and darkness, making them versatile for various tasks such as writing, drawing, and shading. They are commonly used for everyday writing and sketching purposes.

Usage:
HB pencils are widely used in schools, offices, and art studios due to their moderate darkness and durability. They are suitable for tasks that require a combination of precision and shading.

Conclusion:
Understanding the full form of HB and its significance in the world of pencils can help individuals choose the right tool for their specific needs, whether it be for writing, drawing, or sketching.