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WEATHER & CLIMATE, continued
Measuring Dew Point and Relative Humidity—Student Laboratory Kit
Students make direct dew point obser- vation and sling psychrometer dew point measurements, perform a relative humidity calculation and obtain a sling psychrometer relative humidity measurement. The different measurement techniques are compared and contrasted. Includes materials for 15 sling psychrometers, 15 dew point metal cans, detailed teacher notes, student instructions and data sheets.
AP6449 I $144.45
Sling Psychrometers
Easy-to-use, inexpensive sling psychrometer. Quickly determine dew point and relative humidity with the wet-bulb/dry-bulb tech- nique. One kit includes two thermometers mounted on stiff vinyl backing, wet-bulb sleeve, sling handle and mounting screw. Reproducible instruction sheet provides concept explanations, psychrometer chart and sample calculations. Sold individually and as a classrom set of 15!
FB1582 I Classroom Set I $104.95 FB0543 I Individual Kit I $9.70
Ultimate Cloud-Forming Apparatus
Create atmospheric conditions that produce rain, fog and clouds. By introducing smoke from a burning match and a little water vapor to the cloud-forming apparatus, you can create a dense cloud over and over again simply by squeezing and releasing the large rubber bulb. Under high pressure, air can hold a greater amount of water vapor than
it can under less pressure. When the pres- sure is lowered suddenly, the excess vapor condenses and forms tiny droplets around each smoke particle.
AP5302 I $29.15
Weather Station, Wireless
Easy to read, easy to program and afford- able. Data updates every 4 seconds, giving you an accurate weather picture. Displays both outside and inside temperatures as well as a min/max temperature that can
be reset at the touch of a button. Weather forecasting icons and weather tendency indicator is determined by a barometric pres- sure reading that causes the icon to change when a significant change in pressure occurs. Wireless sensor transmits weather data 330 feet and does not need to be by a window. Wall hanging or free standing. Requires 3 AA batteries for the receiver and 2 AA batteries for the sensor, sold separately.
AP7462 I $50.35
WEATHER & CLIMATE I FLINN SCIENTIFIC 65
Digital Tools to Support Hands-on Exploration
Barometer, Digital
AP7527 I $99.75
Product details at flinnsci.com
Thermo-Hygrometer
FB1150 I $89.90
EARTH & SPACE SCIENCE