The part of the peach tree that is commonly referred to as "peach wood" is the wood from the branches and trunk of the tree. This wood is utilized for various purposes, including woodworking projects and as a fuel source. Peach wood is known for its pleasant aroma and is often favored for its grain patterns and workability.

The reason peach wood is used in woodworking and other applications stems from its unique properties. Peach trees are deciduous, and their wood is typically light in color, ranging from a pale yellow to a golden brown. This light coloration is due to the low density of the wood, which also contributes to its ease of carving and shaping. Additionally, peach wood has a fine grain that is straight and uniform, making it ideal for intricate designs and detailed work.

According to a study published in the Journal of Wood Science, peach wood has a specific gravity of around 0.45 to 0.55, which is lower than many other woods, such as oak or maple. This low density makes it easier to work with and less prone to splitting or cracking during the carving process. Furthermore, the wood's hardness is moderate, falling between 1,200 and 1,400 kilopascals (MPa), which is suitable for both hand tools and machinery.

The pleasant aroma of peach wood is another reason it is sought after in woodworking. The scent is often described as sweet and fruity, which can be appealing in furniture and other items where the wood is in close proximity to the user. This aroma is a result of the natural oils present in the wood, which are also responsible for its resistance to decay and insects.

In terms of fuel, peach wood is a popular choice for barbecues and smoking meats due to its high flame temperature and the subtle flavor it imparts to the food. The wood burns cleanly and produces a good amount of heat, making it a practical choice for outdoor cooking.

In conclusion, the part of the peach tree that is known as peach wood is the wood from the branches and trunk. Its use in woodworking and as a fuel source is due to its light color, low density, fine grain, pleasant aroma, and moderate hardness. These properties make peach wood a versatile and desirable material for various applications.