Hydrodynamic refers to the study of fluids in motion, such as the behavior of water flowing in a river or the forces acting on a boat moving through water. Hydrostatic, on the other hand, refers to the study of fluids at rest, such as the pressure distribution in a stationary body of water or the forces acting on a submerged object. In essence, hydrodynamic deals with the movement of fluids, while hydrostatic deals with the equilibrium and pressure distribution of fluids at rest. **

Hydrostatic lubrication involves using an external pump to create pressure that forces the lubricant into the bearing interface, while hydrodynamic lubrication relies on the relative motion between the surfaces to generate the pressure needed to maintain a lubricant film. In hydrostatic lubrication, the lubricant pressure is independent of the motion of the surfaces, whereas in hydrodynamic lubrication, the pressure is generated by the motion of the surfaces. Additionally, hydrostatic lubrication is typically used in high-load or low-speed applications, while hydrodynamic lubrication is more commonly used in high-speed applications. **

When choosing a fabric for upholstery, it is important to consider factors such as durability, comfort, and style. Fabrics like cotton, linen, and polyester blends are popular choices for upholstery due to their durability and ease of maintenance. For a more luxurious feel, velvet or leather can be great options, but they may require more care. Ultimately, the best fabric for upholstery will depend on your personal preferences, lifestyle, and budget. **

To clean greasy fabric upholstery, start by sprinkling baking soda or cornstarch over the greasy area and let it sit for 15-20 minutes to absorb the grease. Then, use a vacuum cleaner to remove the powder. Next, mix a solution of mild dish soap and warm water, and gently scrub the greasy area with a soft-bristled brush or cloth. Finally, rinse the area with a clean damp cloth and allow it to air dry. **

The question about Candy upholstery furniture could be about its durability, maintenance, or design options. It could also be about the materials used in its construction, the comfort level, or the availability of different sizes and configurations. Additionally, the question could be about the pricing and delivery options for Candy upholstery furniture. **

Based on the description provided, the sofa upholstery fabric could be a durable and stain-resistant material such as microfiber or polyester. These fabrics are known for their easy maintenance and ability to withstand daily wear and tear. Additionally, the soft and smooth texture mentioned suggests it could be a velvet or chenille fabric, which are popular choices for adding a touch of luxury and comfort to a sofa. **

Determining the highest quality brand of upholstery furniture can be subjective as it depends on individual preferences and needs. However, some well-known brands that are often associated with high-quality upholstery furniture include Ethan Allen, Restoration Hardware, and Crate & Barrel. These brands are known for their attention to detail, use of high-quality materials, and craftsmanship, making them popular choices for those seeking durable and stylish upholstery furniture. **

A dirty sofa with fabric upholstery may have visible stains, spills, and discoloration. The fabric may appear dull and dingy, with noticeable dirt and grime embedded in the fibers. There may also be a musty or unpleasant odor emanating from the sofa. Overall, a dirty sofa with fabric upholstery can give off a neglected and unclean appearance. **