Mineral wool is a popular choice for sound insulation due to its high density and ability to absorb sound. It is also non-combustible and resistant to moisture, making it a versatile option for soundproofing. On the other hand, sand-lime bricks are known for their high mass and density, which can also provide effective sound insulation. Ultimately, the choice between mineral wool and sand-lime bricks for sound insulation will depend on the specific requirements of the project, including factors such as cost, availability, and the desired level of soundproofing. **

To manually polish terrazzo, you will need a floor polishing machine with diamond polishing pads, a wet/dry vacuum, and a terrazzo polishing compound. Start by thoroughly cleaning the terrazzo surface to remove any dirt and debris. Then, attach a coarse diamond polishing pad to the machine and begin polishing the floor in a circular motion, working in small sections at a time. Gradually switch to finer grit polishing pads until the desired level of shine is achieved. Finally, apply the terrazzo polishing compound to the surface and buff it in with the polishing machine to bring out the final shine. Be sure to use the wet/dry vacuum to clean up any excess water and residue during the process. **

Wool is neither cotton nor merino wool. Wool is a natural fiber that comes from the fleece of sheep, while cotton is a natural fiber that comes from the cotton plant. Merino wool, on the other hand, specifically refers to wool that comes from the merino breed of sheep, known for producing fine, soft, and high-quality wool. So, wool and merino wool are both types of wool, but they are not the same as cotton. **

Silica sand is commonly used as impact protection in various applications. This type of sand is known for its hardness and resistance to wear, making it ideal for absorbing impact and providing a cushioning effect. Silica sand is often used in playgrounds, sports fields, and other areas where impact protection is needed to help reduce the risk of injuries. **

Mineral wool, rock wool, and glass wool are hanging under the oven to provide insulation and prevent heat loss. These materials have high thermal resistance and are able to withstand high temperatures, making them ideal for insulating the underside of the oven. By hanging these materials, the oven is able to retain heat more effectively, resulting in improved energy efficiency and cooking performance. Additionally, the insulation helps to protect the surrounding cabinetry and flooring from excessive heat. **

Wool sweaters and pure wool leggings, such as Lopi wool, should be washed infrequently to maintain their quality and shape. It is recommended to wash them only when they are visibly soiled or have absorbed odors. Typically, wool garments can be aired out and spot cleaned to maintain freshness between washes. When it is time to wash them, it is best to hand wash them in cold water with a gentle wool detergent and lay them flat to dry to avoid shrinking or stretching. **

No, dry sand is not heavier than wet sand. When sand becomes wet, the water fills the spaces between the grains of sand, adding weight but not necessarily making it heavier. In fact, wet sand can be easier to move and shape because the water helps the grains stick together. **

As an AI, I don't have personal preferences, but I can tell you that wool sweaters made from sheep's wool are popular for their warmth, durability, and natural insulating properties. Many people appreciate the softness and comfort of wool sweaters, as well as their ability to keep them warm in cold weather. However, some individuals may have sensitivities to wool or prefer alternative materials for ethical or environmental reasons. Ultimately, whether someone likes wool sweaters made from sheep's wool is a matter of personal preference. **