The melting point of a solid is the temperature at which it changes state from solid to liquid at atmospheric pressure. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at standard pressure. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point. Because of the ability of some substances to supercool, the freez
TV manufacturers say that most DLP rear-projection television lamps last between 1,000 and 2,000 hours. However, these burn-out times vary and can range quite a bit. Some lamps last only 500 hours, while others can last 8,000 hours or more. Much of a lampâs life span is based on its usage. On average, most lamps are replaced every one to two years. Lamp replacement costs vary widely and depend on the lamp and its manufacturer. A quick Internet search or phone call to the manufacturer can pinpoint how much a particular projection lamp costs.
How to Choose the Right Size Lamp Shade. Sizing Basics. A good rule of thumb to determine lamp shade size for a table lamps is the bottom of the shade should be approximately 6 to 9 inches wider than the widest part of the base. The height of the shade should be approximately 2/3 of the height of the lamp base. Here is an example of fitting a shade to the lamp shown: Lamp base at the widest point is 9 inches wide so the lampshade should be approximately 15/16 inches wide.