/usr/share/sensor_msgs/msg/RelativeHumidity.msg is in libsensor-msgs-dev 1.12.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | # Single reading from a relative humidity sensor. Defines the ratio of partial
# pressure of water vapor to the saturated vapor pressure at a temperature.
Header header # timestamp of the measurement
# frame_id is the location of the humidity sensor
float64 relative_humidity # Expression of the relative humidity
# from 0.0 to 1.0.
# 0.0 is no partial pressure of water vapor
# 1.0 represents partial pressure of saturation
float64 variance # 0 is interpreted as variance unknown
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