对使用称重法测量不规则黄铜试样横截面积的不确定度来源进行了分析，并对黄铜试样的横截面积的测量不确定度进行了评定。结果表明：使用称重法测量不规则黄铜试样的横截面积时，其不确定度来源主要包括试样长度的测量不确定度、试样质量的测量不确定度、测量试样密度时水温的测量不确定度等方面。试验用不规则黄铜试样横截面积的测量不确定度报告为：试样横截面积S₀=63.14 mm²，扩展不确定度U=2.25 mm²，包含因子k=2。

The sources of uncertainty in measuring the cross-sectional area of irregular brass specimens through weight method were analyzed, and the measurement uncertainty of the cross-sectional area of the irregular brass specimens was evaluated. The results show that:the uncertainty sources of measuring the cross-sectional area of irregular brass specimens through weight method mainly included measurement uncertainty of the specimen length, measurement uncertainty of the specimen quality, measurement uncertainty of the water temperature when measuring the specimen density and so on. The uncertainty report of measuring cross-sectional area of irregular brass specimens for the test was:the cross-sectional area S₀ of the specimen for the test was 63.14 mm², the expanded uncertainty U was 2.25 mm², and the coverage factor k was 2.