Tungsten is used as filament in bulb because it has high melting point, brighter light and greater efficiency!

Why Tungsten is Used as a Filament in Bulbs
Tungsten is the preferred material for filaments in incandescent bulbs due to its unique properties. Below are the reasons that highlight its significance:
High Melting Point
- Tungsten has an exceptionally high melting point of approximately 3,422°C (6,192°F). This allows it to withstand high temperatures without melting, essential for producing light.
Excellent Electrical Conductivity
- Tungsten is a good conductor of electricity. When an electric current passes through the tungsten filament, it heats up quickly, producing light.
Durability and Strength
- Tungsten is a strong metal, resistant to breakage. This durability ensures that the filament lasts longer, reducing the frequency of bulb replacements.
Low Vapor Pressure
- Tungsten has a low vapor pressure at high temperatures. This means that it does not evaporate quickly, which helps maintain the filament’s integrity over time.
Efficient Light Production
- The filament's ability to heat up to high temperatures allows it to produce a bright, warm light that is desirable for various applications in homes and industries.
Cost-Effectiveness
- While tungsten is more expensive than some other metals, its longevity and efficiency make it a cost-effective choice in the long run.
In conclusion, tungsten’s unique combination of high melting point, durability, excellent conductivity, and low vapor pressure make it an ideal choice for filaments in incandescent bulbs, providing efficient and reliable lighting solutions.