It means that at the given air temperature the air contains 70% of the amount of moisture the air can hold before condensing as water. It is relative because hotter air holds more water, so it it a lot more moist at high temperatures for a given relative humidity.
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what does RH% mean
70%
49/70 x 100 = 70 percent.
2 percent of 70 =1.42% of 70= 2% * 70= 0.02 * 70= 1.4
27 percent of 70 = 18.927% of 70= 27% * 70= 0.27 * 70= 18.9