N a vertical glass tube partly evacuated and partly filled with mercury, the height of which is used as a measure of atmospheric pressure 托里切利管(一部分真空、一部分注有水银的垂直玻璃管，其高度用来测量气压)
N（名词） a vertical glass tube partly evacuated and partly filled with mercury, the height of which is used as a measure of atmospheric pressure 托里切利管(一部分真空、一部分注有水银的垂直玻璃管，其高度用来测量气压)