鉛筆h的意思

"H" in pencil stands for "hard". Pencils are graded on a scale that indicates the hardness of the graphite core, which affects the darkness and ease of marks made on paper. The scale typically ranges from 9H (the hardest) to 9B (the softest).

Here's a brief overview of the pencil hardness scale:

• H (Hard): These pencils produce lighter marks and are less prone to smudging. They are good for making precise lines and are often used in technical drawing, drafting, and making initial sketches.
• HB: This is the middle of the scale and is considered a "hard black" pencil. It's a balanced choice, suitable for most writing and sketching.
• B (Soft): These pencils are softer and produce darker marks. They are often used for shading and creating a high contrast in drawings.
• 2B, 3B, 4B, 5B, 6B, 7B, 8B, 9B (Very Soft): These pencils are increasingly soft and produce very dark marks. They are used for creating bold, expressive strokes and for shading in areas that need a deeper tone in a drawing.

The letter "B" originally stood for "black", while "H" stood for "hard". The scale was developed to indicate the graphite's hardness and the darkness of the mark it would make. The scale is not linear, meaning a 2B pencil is softer and darker than a B, but not twice as much. The difference between each grade is subtle and allows for a wide range of artistic expression and technical precision.