🔍 Key Concepts

• Soft solder vs silver solder (hard solder) and their typical temperature ranges • Common base metals used for low-temperature joining in plumbing and electronics • Relationship between melting point and the type of alloy used

💭 Think About

• Which of the listed base alloys is commonly used with tin for low-temperature soldering in electronics or light plumbing? • Think about which alloys are usually reserved for high‑strength, high‑temperature joints such as brazing or silver soldering, and eliminate those. • From daily life: when you see simple solder wire on a reel, what metals does it usually contain?

✅ Before You Answer

• Verify which option is typically combined with tin to make traditional soft solder. • Eliminate alloys usually used for high‑temperature brazing rather than low‑temperature soldering. • Focus on which base alloy is known for low melting point and ease of flow rather than high strength at high temperatures.