A desk is generally the best place for a laptop computer.
In recent years, computer manufacturers have come to refer to laptop computers as "notebooks," perhaps to discourage customers from using laptops on their laps. Using a laptop on your lap for extended periods is generally unwise, because it can hamper the computer's ability to cool itself. It can also cause discomfort, soreness and potential long-term health problems.
Cooling
Many laptops have air intake vents on the bottom. If you use a laptop on your lap and are not careful, you could block your computer's intake vent and hamper the ability of the cooling system to bring cool air into the computer and expel hot air from the exhaust vent. If your laptop is unable to cool itself, it could overheat. This could lead to instability and long-term damage.
Discomfort
Modern computer components generate a great deal of heat while running, and manufacturers have to use a variety of tricks to keep hot components in thin laptops within the proper temperature ranges. One trick involves the laptop base, which is commonly made from aluminum. Because aluminum is a good conductor of heat, the base of the computer draws heat to the outside of the computer where it dissipates through convection. If you use a laptop on your lap, the heat may cause discomfort.
Posture
The basic design of a laptop encourages poor posture. Even if you use a laptop on a desk, you generally have to crane your neck down to see the screen. This problem is exacerbated when you use the laptop on your lap, which places the computer in a much lower position than any desk. Over time, this can lead to neck strain and soreness.
Male Reproductive Health
According to a 2010 article published by CBS News, evidence suggests that men who use laptops on their laps risk impaired fertility. A hot laptop can cause a man's testicles to become overly warm, which can reduce sperm quality and cause conception to be difficult.
