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?
The new definition says absolute humidity is the mass of the water vapor in a volume divided by the mass of dry air in the said volume. This definition is much convenient when dealing with pressure changes. However, to avoid confusion, the first definition is renamed as the volumetric humidity. Relative Humidity. Relative humidity is important when the real effect of the humidity is concerned. To understand the concept of relative humidity, there are two concepts that are needed to be addressed first. First one is the partial pressure.