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.
The size of your lamp should be based upon the size of the bedside table it sits upon and the height of the headboard. If your nightstand is 24 to 30 inches tall, the ideal height for a lamp is 27 to 32 inches tall, advises the website William Miller Design.