CREATE TABLE table_43081 ("Usage" TEXT, "Sn/Sb  ( % ) " TEXT, "Liquid at  ( \\u00b0C ) " TEXT, "Casting at  ( \\u00b0C ) " TEXT, "Remelting at  ( \\u00b0C ) " TEXT, "Hardness" TEXT)

What is the hardness for the alloy that is liquid at 243 degrees C?
SELECT "Hardness" FROM table_43081 WHERE "Liquid at (\u00b0C)" = '243'
SELECT "Hardness" FROM "table_43081" WHERE "Liquid at (\u00b0C)" = '243'