as glass heats and begins to melt, the flame becomes yellow, what causes the color?

Question:

Answer: Often a yellow color can come from the presence of sodium in a sample. Glass often contains a fair amount of sodium. Sodium emits yellow light when excited atoms return to their ground state. This is the principle of the "sodium vapor lamp" that you often see in the parking lots of big-box stores or along freeways. If the GLASS is becoming red to yellow to white, that is because it is just getting real hot (it's called a "black body spectrum" then). Remember to choose the BEST answer. don't just leave it for the "voters" because then the FIRST answer is automatically chosen. You wouldn't want that.

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