Introduction:
A Bourdon tube pressure gauge is a mechanical device used to measure the pressure of a fluid (liquid or gas). It consists of a curved tube, known as the Bourdon tube, which deforms when subjected to pressure changes. This deformation is then converted into a readable pressure measurement.

Explanation:
A Bourdon tube pressure gauge is designed to measure both low and high pressures. Let's understand why it is capable of measuring a wide range of pressures:

1. Operating Principle:
The Bourdon tube pressure gauge operates on the principle of elastic deformation. When pressure is applied to the inside of the curved tube, it tends to straighten out. This causes the free end of the tube to move, which is then translated into a pressure reading on the gauge.

2. Bourdon Tube Design:
The Bourdon tube is designed in such a way that it can handle a wide range of pressures. It is typically made of a metal alloy with good elasticity, such as brass or stainless steel. The tube is curved into a C-shape or helical shape, which allows it to withstand both low and high pressures without permanent deformation.

3. Low Pressure Measurements:
For low pressures, the Bourdon tube undergoes a small amount of elastic deformation. The tube expands slightly, causing the free end to move. This movement is magnified through a mechanical linkage and displayed on the gauge as a pressure reading. The gauge is calibrated to accurately measure and display low pressures.

4. High Pressure Measurements:
For high pressures, the Bourdon tube undergoes a significant amount of elastic deformation. The tube straightens out to a certain extent, causing the free end to move more prominently. This movement is again magnified and displayed as a pressure reading. The gauge is calibrated to accurately measure and display high pressures.

5. Pressure Range:
The pressure range that a Bourdon tube pressure gauge can measure depends on its design and construction. It can typically measure pressures ranging from a few millibars to several thousand bars. The specific pressure range of a gauge is usually indicated on its dial.

Conclusion:
In conclusion, a Bourdon tube pressure gauge is capable of measuring both low and high pressures. Its design and operating principle allow it to accurately measure a wide range of pressures, making it a versatile device for pressure measurement applications.