Relative humidity, a percentage, is the ratio between the water vapor present and the air's saturation point, a figure that changes with the temperature.

相对湿度，是空气中绝对湿度与饱和湿度的比值，它随着温度变化。

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It takes the right combination of wind,temperature,pressure and humidity to create even a weak tornado.

VOA: special.2010.05.11

Those who can handle abrupt temperature changes can try the four room Nun Path, a variation of hot to cold with variations of humidity, a revival of a Roman regeneration treatment. (although only the most stalwart should attempt the Frigidarium.) And treatments span the globe, from hammam rituals to Thai and Ayurvedic.

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Motorola's new Home Monitoring and Control System HMEZ1000, a system of wireless network cameras and sensors that let's you keep tabs on your home from anywhere, and will automatically email or text message you when a door or window is opened, or when the temperature or humidity hits a certain level.

ENGADGET: An evening with Motorola

The Chilean desert's lack of humidity was a big reason for the telescope's placement, 16, 400 feet above sea-level, aiding precision of the scope.

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