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Scaling a thermometer

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Introduction

Physics Lab Ali Dakik Scaling a thermometer Date of Lab: 2nd September 2005 Aim: * Making a thermometer scale by locating its fixed points. * Investigating the properties of a thermometer Variables: Dependent: length of mercury liquid L/cm Independent: Temperature T/?C Controlled Variables: mercury glass tube, pressure Materials Required: A Bunsen burner 2 500ml beakers A glass thermometer, with no scale Ice A permanent marker Water Method: * To scale a thermometer, 2 fixed points must be determined. ...read more.

Middle

* After 15 min, mark the mercury level in the tube using a permanent marker. Since the freezing point of ice is 0?C, then the mercury level of the tube refers to this value. * Now, place the tube into a beaker of boiling water. Water boils at 100?C and thus, the mercury level in the tube will rise to a level representing a temperature of 100?C. ...read more.

Conclusion

Conclusion and Evaluation: A thermometer scale consists of two fixed points. For mercury, the scale usually ranges from 0?C to 100?C. This is because mercury solidifies below 0?C and stops expanding efficiently over 100?C. However, for other thermometer scales, different ranges are used. It is important to conclude that in a thermometer the expansion of the liquid is always uniform and this is the most important property. In addition, it is important that the liquid used be visible. In this case, mercury is well seen but in some cases where alcohol is used, it cannot be seen. ...read more.

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