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VIDEO FRAME
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NARRATIVE
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Changes in temperature affect
the viscosity of water, and this affects the settling rates of
particles in suspension. Therefore, an analyst must maintain a
constant known temperature to obtain accurate results during a
pipette analysis. The analyst may also find it advantageous to
accelerate a pipette analysis by elevating the temperature of the
suspension. The most practical way to control the temperature of the
suspension during pipette analysis is with a constant temperature
bath. |
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A simple constant temperature bath can be
constructed with a 20-gallon fish tank, |
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a rubber mat to protect the
glass bottom of the tank,
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and a recirculating water heater. |
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Effective insulating materials
include 1-inch plastic balls to cover the water surface |
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and foam-core plastic boards to insulate the
tank walls. |
