🔍 Key Concepts

• Specific gravity as a measure of electrolyte density compared to water • Effect of temperature on density and hydrometer readings • Proper procedure for taking a hydrometer reading on a lead-acid battery

💭 Think About

• How does cooling or heating a liquid usually affect its density and therefore its specific gravity? • If you add water to a battery, what needs to happen before you can get a reliable hydrometer reading? • Would temperature realistically have no effect at all on the density of a liquid electrolyte?

✅ Before You Answer

• Recall that higher temperature generally lowers liquid density, and lower temperature increases it. • Think about whether a freshly added layer of water will be fully mixed with the electrolyte right away. • Eliminate any option that claims temperature has no effect on specific gravity, based on basic physical principles.