Final answer:
The color classification of frangible bulbs corresponds to the operating temperature range of automatic fire sprinklers, with different colors indicating different temperature thresholds for activation.
Step-by-step explanation:
The question refers to the color classification of frangible bulbs used in automatic fire sprinkler systems. These bulbs are filled with a liquid that expands upon heating, causing the bulb to fracture and thus activate the sprinkler. The color of the bulb typically indicates the temperature range at which the bulb will operate.
For example, orange or red bulbs may be designed to operate at higher temperatures than green or blue bulbs.
Moreover, the image of a campfire with colored flames from burning a garden hose in a copper pipe can visually explain how various materials and chemicals result in different flame colors, which reflects the concept of chemical reactions and the release of energy in the form of light within a specific wavelength/color.