🔍 Key Concepts

• Basic meteorological instruments and what they measure • Difference between speed, temperature, pressure, and humidity • How a psychrometer is used in weather observations

💭 Think About

• For each instrument, ask yourself: what physical quantity does it normally measure in weather and navigation contexts? • Focus especially on the less familiar term: what is a psychrometer used to determine on a ship or at a weather station? • Compare the words: does the suffix or root (like "-meter") plus the context give a clue about what it actually measures?

✅ Before You Answer

• Be sure you know which instrument is used to measure atmospheric pressure on board or in weather reports. • Confirm which device is standard for wind speed measurements (often reported in knots). • Double-check what a psychrometer actually measures during humidity or dew point observations, and whether it has anything to do with pressure.