5 to 6 months. Practices intonation by making her voice rise and fall, often in response to baby talk and your facial expressions. Red flag: If your child isn't making vocal sounds by the time she's 6 months old, talk with her doctor. 7 to 12 months. Babbles with greater diversity, making new sound combinations and intonations. Red flag: If your child isn't making vocal sounds by age 7 months, talk with his doctor.
Relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold. For instance, if the relative humidity was 50%, then the air is only half saturated with moisture. Warmer air can hold more moisture than colder air. Why is relative humidity important?
Noun. 1. relative humidity-the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature; expressed as a percentage. ratio-the relative magnitudes of two quantities (usually expressed as a quotient). 1  Facebook. 2  Twitter.