質量

The character 質 is pronounced "zhi4" in China and "zhi2" in Taiwan.

"Quality" is 品質 "pin3 zhi2" in Taiwan but it is 质量 "zhi4 liang4" in China. 质量 means "mass" in Taiwan and Japan. "The law of conservation of mass" is translated 质量守恒定律 (質量守恆定律) both in China and Taiwan. We, Japanese, call it 質量不変の法則.