Question

How is heat loss prevented in a calorimeter?

Answer 1

The chemical instruments are used to measure various quantities like temperature, heat, entropy, rate of reaction, stability constants and many more by different instruments. Several instruments require vacuum like S.E.M (Scanning electron microscope), T.E.M (Transmission electron microscope) while some can be carried out anywhere.

Complete answer:
Several instruments have been developed by scientists. One of the most important instruments is the calorimeter.
Calorimeter is an instrument used to calculate the heat capacity during a physical or a chemical reaction. The mechanical stirrer in a calorimeter is called a beckmann thermometer.
A calorimeter consists of a thermometer, oxygen under pressure, insulated water bath, bomb (strong metallic chamber), stirrer, sample in a platinum cup, oxygen inlet, and firing leads.
A calorimeter is open to the atmosphere thus capable of measuring the heat change at constant pressure.
Some useful formulas used in calculation of calorimeter are as follows: -
${H_p} = {H_c} \times \Delta t \times {S_H}$ where ${H_p}$ is heat produced during combustion, ${H_c}$ is heat capacity, $\Delta t$ is rise in temperature, ${S_H}$ is specific heat of water.
The heat capacity is calculated by the formula $= \dfrac{{{W_2}({t_2} - {t_3})}}{{({t_3} - {t_1})}}{W_1}$ .
The heat loss in the calorimeter is prevented by placing it in a vessel made up of wool or other conductance material. The heat loss can also be prevented by making the surface smooth and shiny.

Note:
Calorimeter is a device used for the measuring of the heat developed during any reaction. The reaction may be mechanical, chemical or electrical. It is also used for the heat capacity. One of the most commonly used calorimeters is the bomb calorimeter. In the bomb calorimeter water is used and its temperature is calculated with the help of a thermometer.