Inside this vacuum, there’s a thin coiled wire called a ... tungsten doesn’t rust away or “oxidise” when it gets hot. Tungsten is used in light bulbs because it has a really high melting point (over 3 ...

Inside this vacuum, there’s a thin coiled ... Tungsten is used in light bulbs because it has a really high melting point (over 3,000°C), which is much higher than the temperature needed to ...