(i) Give reason for using dark coloured clothes in winter and bottom of utensils used for cooking food being black.
(ii) Draw a table to compare the Kelvin, Celsius and Fahrenheit scales of temperature (steam point, ice point, absolute zero).

In the Celsius scale, melting point of ice is 0°C . Another scale of temperature is based on absolute zero . a) Identify the scale.

Give reasons for the following : Ionic compounds have high melting points and boiling points. (ii) Ionic compounds conduct electricity in molten state. (iii) Ionic compounds are solids at room temperature and are somewhat hard. (iv) Ionic grills are frequently painted. (v) Gold ornaments retains their lustre even after several years of use.

Answer the following : (a) The triple-point of water is a standard fixed point in modern thermometry. Why ? What is wrong in taking the melting point of ice and the boiling point of water as standard fixed points (as was originally done in the Celsius scale) ? (b) There were two fixed points in the original Celsius scale as mentioned above which were assigned the number 0^(@)C" and "100^(@)C respectively. On the absolute scale, one of the fixed points is the triple-point of water, which on the Kelvin absolute scale is assigned the number 273.16 K. What is the other fixed point on this (Kelvin) scale ? (c ) The absolute temperature (Kelvin scale) T is related to the temperature t_(c) on the Celsius scale by t_(c)=T-273.15 Why do we have 273.15 in this relation, and not 273.16 ? (d) What is the temperature of the triple-point of water on an absolute scale whose unit interval size is equal to that of the Fahrenheit scale ?

In the given table , the column shown the lower fixed point (LEP), Column II shows the upper fixed point (UFP) and the Column III gives corresponding division on the scale for three different scales for temperature measurement . Determine the features of Fahrenheit scale.

A faulty constant volume thermometer using helium gas records a pressure of 1.65 xx 10^4 Pa at normal freezing point of water, and a pressure of 2.10 xx 10^4 Pa at normal boiling point of water. Using these observations, determine the temperature of absolute zero on the Celsius scale.