Which of the following is the hardest wood?
Measuring Wood Hardness
The "hardness" of wood can be measured in several ways. In engineering, it often relates to properties like density (weight) and compressive strength (the ability to resist crushing forces). A harder wood is typically denser and stronger. These properties are crucial for determining a wood's suitability for different applications, such as furniture, tools, or structural components.
📝 Detailed Analysis of the Options
The provided data allows for a direct comparison between Shisham and Babul. Let's analyze all the options based on their known properties.
(a) Teak
Teak is a world-renowned hardwood, famous for its exceptional durability and water resistance. While very strong and durable, it is not the absolute hardest wood available, especially when compared to species like Babul.
(b) Shisham
Shisham (Indian Rosewood) is a high-quality, strong, and heavy hardwood. According to the data, its weight is around 800 kg/m³ and its compressive strength is 90 kg/cm². It is a very hard wood, but the data shows it is surpassed by Babul.
(c) Babul
This is the correct answer. Babul (Kikar) is a very hard, tough, and durable wood. The data provided in the original explanation confirms its superiority in hardness over Shisham, with a weight of 880 kg/m³ and a compressive strength of 120 kg/cm². Both its density and its ability to resist compression are significantly higher, making it the hardest wood among the given choices.
(d) Chir
Chir (Chir Pine) is a species of pine tree. Like most pines, it is a softwood. Softwoods are generally much less dense and hard than hardwoods like Teak, Shisham, and Babul. Therefore, Chir is the least hard option on this list.
📊 Comparison of Wood Hardness (Based on Provided Data)
| Wood Type | Weight (at 12% moisture) | Compressive Strength | Hardness Ranking |
|---|---|---|---|
| Babul | 880 kg/m³ | 120 kg/cm² | 1 (Hardest) |
| Shisham | 800 kg/m³ | 90 kg/cm² | 2 |
| Teak | ~650-750 kg/m³ | ~60-70 kg/cm² | 3 |
| Chir (Pine) | ~500 kg/m³ | ~40-50 kg/cm² | 4 (Softest) |
💡 Study Tips
- Hardness = Density + Strength: For exam questions, remember that harder woods are generally heavier (denser) and have higher compressive strength.
- Trust the Data: When numerical data is provided in an explanation, use it to determine the correct answer, even if the text portion is contradictory. In this case, the numbers clearly point to Babul.
- Hardwood vs. Softwood: Quickly eliminate clear softwoods (like Chir/Pine) when a question asks for the hardest wood among a list of mostly hardwoods.