In This Issue:
The Caliper V14 #1 Cover
Chemistry
Biology
Physics
CBL™ News
Workshops & Contests
Bits & Bytes
Science Humor

New Products:
New Motion Detector
Lower Priced Sensors
Exercise Heart Rate Monitor
Instrumentation Amplifier
Ion Selective Electrodes
Rechargeable Battery Pack
Logger Pro Books
CBR™
TI-86

Go to other past issues of
The Caliper

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Vernier Home Page

Exercise Heart Rate Monitor
We have found that when used with the CBL™, our new Exercise Heart Rate Monitor becomes a portable and effective way of monitoring heart rate in a variety of situations outside of the classroom. Below is a graph of Dave Vernier's heart rate while running. These data were collected with the Exercise Heart Rate Monitor and CBL, and then downloaded into Graphical Analysis.

Do you ever wonder what happens to your heart rate when you get hot? I decided to find out by taking an Exercise Heart Rate Monitor and CBL with me into a sauna. I spent 10 minutes sitting in the sauna while monitoring my heart rate. After 10 minutes, I left the sauna and sat on a bench to cool down. The data were then downloaded into Graphical Analysis. The graph below shows my heart rate increasing as I was subjected to the 200°F (93.33°C) environment. When I returned to an environment of 75°F (24°C), my heart rate steadily decreased.

Biology with Computers for Logger Pro
A new version of Biology with Computers using the new Logger Pro for Windows software (order code BWC-LPW) has just been released. It includes labs for our newer probes, such as the
CO₂ Gas Sensor, EKG Sensor and Exercise Heart Rate Monitor. All of our lab manuals are $35.

Photosynthesis Happens!
Dave Masterman of Lakeside School in Seattle, Washington has found an easy way to show photosynthesis in action using our new CO₂ Gas Sensor. When shipped, the sensor includes a 250-mL Nalgene bottle and a slit stopper. The sensor is fitted with a slit stopper that allows a good fit in the opening of the 250-mL bottle.

To perform the experiment, place 3-5 small, freshly picked leaves from a tree or bush into the bottle. Fit the shaft of the CO₂ Gas Sensor into the opening of the bottle and secure with the slit stopper. Collect data at a rate of 1 point every 10 seconds for 10 minutes. Place the bottle with the sensor and leaves in front of a bright light source. Put a beaker filled with room temperature water between the bottle and the light source. The beaker will act as a heat shield. Collect data for 5 minutes with the light on. At 5 minutes, turn off the light while continuing to collect data. In the graph below, data were collected for 50 minutes. Every 8 or 9 minutes the light was turned on or off. The graph shows carbon dioxide being removed from the container when the light was turned on (photosynthesis). The graph also shows carbon dioxide being produced when the light was turned off (respiration).