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Why does some wavy hair curl, and others does not? Some wavy hair will curl with certain styling products, with humidity – just plain unpredictably on some days and not on others. In this post the story was about how fine hair often does not have the structural support to maintain a wave of curl if there is weight on it from the sides or weight from length (or water or styling products). Many people with wavy hair, especially wavy hair that does not wave and curl consistently have fine hair and that explains much wavy-haired frustration. ©Science-y Hair Blog 2013 But this doesn’t explain how people who have average-width or wide (coarse) hair can have loose waves too. Or how wavy hair can be fairly curly. Imagine driving a car or a bicycle. You turn the steering wheel or handlebars just a little. You will begin to turn in a large circle – you may run out of space to complete your turn. If you turn the wheel more sharply, you will make a sharper turn and go around in a tighter circle. ...

This post is timely to those of us in the Northern Hemisphere - to our friends and family in the Southern Hemisphere - hope you are enjoying spring into summer! Humidity is water vapor suspended in the air. How humidity is measured: Dewpoint – the temperature at which the air is saturated with as much water as it can hold, and so dew (or fog) forms. Dewpoint tells us the most about how dry the air is. Unless a new air mass moves in, the dewpoint can stay the same all day. This is what you want to watch to know just how moist or dry the air is. Dewpoints below 50° F (10° C) are “dry.” In the 50s  (10-15° C) is “comfortable” 60-65° (15- 18° C) is “muggy” 65-70° (18-21° C) is “humid” 70° (21° C) and greater is “oppressive” – rainforest-y - you feel you need to grow gills This is important for hair because dewpoint tells you how much moisture is in the air. Except for hair which has a very strong curl pattern, low moisture in the air tends to lead to flatter, less defined wavy or curl...