Q4 of 11 Page 89

Collect information regarding different kinds of thermometers and record the situations in which they are used. (hint: ma× imum – minimum thermometer).

•Probe Thermometers - They deliver instant temperature readings of foods, liquids, and semi-solid samples. The probe is often equipped with a pointed tip making them ideal for penetration and immersion. They are ideal for use in the catering trade for hygiene testing, retail outlets, and laboratories.

•Infrared Thermometers - Infrared thermometers are one of the go-to types of thermometer for non-contact measurement. The non-contact feature makes them the best tool for measuring e× tremely high or low surface temperatures. It is common for them to include a laser targeting system designed to show the center of the measurement area.


•K – Type Thermometers - -Type thermocouples are one of the more specialized and niche types of thermometer. They deal with e× treme temperatures and are most common in laboratories and industry. This type of device caters for applications that need high precision.


More from this chapter

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7

2 kg of water at 293 K is converted completely into ice at 273 K. Calculate the heat liberated.

 1

2 kg of ice at –10°C is continuously heated to melt it completely. Calculate the quantity of heat required. (The latent heat of fusion of ice: 336 × 103 J/kg. The latent heat of vaporization of water: 226 × 104 J/kg. Specific heat capacity if ice: 2.1 × 103 J/kg K. Specific heat capacity of water: 4.2 × 103 J/kg K.)

 2

A solid of initial temperature 0°C is heated. A graph showing changes in the temperature according to the heat supplied is given below.


Based on the graph calculate the following. (Specific heat capacity of the substance: 500J kg–1 K–1)


(a) the mass of solid substance


(b) the latent heat of fusion of the substance

 3

A hole was drilled in an ice block at 273 K. When the hole was filled with water at 373 K, 2 kg of ice melted and changed into water at 273 K. If so, what is the mass of water at 373 K that was used? (Specific heat capacity of water 4200 J kg–1 K–1, latent heat of fusion of ice: 336 × 103 J/kg)