Question

Принцип действия термометра Веджвуда

Answer 1

Принцип работы электрических термометров основан на изменении сопротивления проводника при изменении температуры окружающей среды.

Электрические термометры более широкого диапазона основаны на термопарах (контакт между металлами с разной элетроотрицательностью создаёт контактную разность потенциалов, зависящую от температуры) .

Наиболее точными и стабильными во времени являются термометры сопротивления на основе платиновой проволоки или платинового напыления на керамику. Наибольшее распространение получили PT100(сопротивление при 0°С - 100Ω) PT1000(сопротивление при 0°С - 1000Ω) (IEC751). Зависимость от температуры почти линейна и подчиняется квадратичному закону при положительной температуре и уравнению 4 степени при отрицательных (соответствующие константы весьма малы, и в первом приближении эту зависимость можно считать линейной) . Температурный диапазон -200 +800°С.

Answer 2

Principle of Operation of the Wedge Wood Thermometer

The Wedge Wood thermometer is a type of thermometer that operates based on the principle of thermal expansion. It was invented by Josiah Wedgwood, an English potter, in the late 18th century. The thermometer consists of a glass tube filled with mercury or alcohol and a wedge-shaped ceramic scale.

When the temperature changes, the liquid inside the thermometer expands or contracts, causing the level of the liquid to rise or fall. This change in liquid level is then read on the scale, which is marked with temperature values.

The Wedge Wood thermometer is based on the principle that different substances expand or contract at different rates when heated or cooled. In this case, the liquid inside the thermometer expands or contracts more than the glass tube, causing the liquid level to change.

The Wedge Wood thermometer is a simple and reliable instrument for measuring temperature. However, it has some limitations. It is not suitable for measuring very high or very low temperatures, as the liquid inside the thermometer may freeze or boil. Additionally, the accuracy of the thermometer may be affected by factors such as atmospheric pressure and the quality of the glass tube.

Overall, the principle of operation of the Wedge Wood thermometer is based on the measurement of thermal expansion and contraction of a liquid inside a glass tube, which is then read on a scale to determine the temperature.

Note: The information provided above is based on general knowledge about the Wedge Wood thermometer. For more specific and detailed information, it is recommended to refer to reliable sources or consult experts in the field.