It helps to picture “air” as having “space” in between. The higher the temperature, the more space there is between the air. An imperfect but nice to picture example is water vapor vs liquid water vs ice.
The more space, the more room there is to hold water. Relative humidity is a ratio between how much water is in the air vs how much water the air can hold. If you reduce the temperature, the space between the air shrinks and you can hold less water
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