Chapter U3.53, Problem 6E

(a)

Interpretation Introduction

Interpretation : The given temperature has to be described as warm, hot or cold.

Concept Introduction : Room temperature is often considered to be 20⁰C or 68⁰F or 293K. One can convert a temperature in Celsius to kelvin by adding 273 to it and vice versa.

Answer to Problem 6E

100K is cold.

Explanation of Solution

To convert a temperature in Kelvin to Celsius one can simply subtract 273 from temperature in Kelvin.

On the Celsius scale, 100K is $100-273=-173{}^{\text{o}}\text{C}$

This is very cold temperature.

(b)

Interpretation Introduction

Interpretation : The given temperature has to be described as warm, hot or cold.

Concept Introduction : Room temperature is often considered to be 20⁰C or 68⁰F or 293K. One can convert a temperature in Celsius to kelvin by adding 273 to it and vice versa.

Answer to Problem 6E

60⁰C is very hot.

Explanation of Solution

Since approximately 20 ⁰C is considered to be room temperature, 60⁰C is a very high temperature so it will be very hot.

(c)

Interpretation Introduction

Interpretation : The given temperature has to be described as warm, hot or cold.

Concept Introduction : Room temperature is often considered to be 20⁰C or 68⁰F or 293K. One can convert a temperature in Celsius to kelvin by adding 273 to it and vice versa.

Answer to Problem 6E

250K is cold.

Explanation of Solution

To convert a temperature in Kelvin to Celsius one can simply subtract 273 from temperature in Kelvin.

On the Celsius scale, 250 K is $250-273=-23{}^{\text{o}}\text{C}$

This is very cold temperature as approximately 20⁰C is the room temperature.

(d)

Interpretation Introduction

Interpretation : The given temperature has to be described as warm, hot or cold.

Concept Introduction : Room temperature is often considered to be 20⁰C or 68⁰F or 293K. One can convert a temperature in Celsius to kelvin by adding 273 to it and vice versa.

Answer to Problem 6E

25⁰C is warm.

Explanation of Solution

Since approximately 20⁰C is considered to be room temperature, 25⁰C is a warm temperature.

(e)

Interpretation Introduction

Interpretation : The given temperature has to be described as warm, hot or cold.

Concept Introduction : Room temperature is often considered to be 20⁰C or 68⁰F or 293K. One can convert a temperature in Celsius to kelvin by adding 273 to it and vice versa.

Answer to Problem 6E

300K is slightly hot or warm.

Explanation of Solution

To convert a temperature in Kelvin to Celsius one can simply subtract 273 from temperature in Kelvin.

On the Celsius scale, 300K is $300-273=27{}^{\text{o}}\text{C}$

This is a slightly hot or warm temperature as 20⁰C is considered to be room temperature.

(f)

Interpretation Introduction

Interpretation : The given temperature has to be described as warm, hot or cold.

Concept Introduction : Room temperature is often considered to be 20⁰C or 68⁰F or 293K. One can convert a temperature in Celsius to kelvin by adding 273 to it and vice versa.

Answer to Problem 6E

-100⁰C is very cold.

Explanation of Solution

Since 20⁰C is considered to be room temperature also, 0 ^oC is freezing point of water thus, -100⁰C is a very low temperature so it will be very cold.

(g)

Interpretation Introduction

Interpretation : The given temperature has to be described as warm, hot or cold.

Concept Introduction : Room temperature is often considered to be 20⁰C or 68⁰F or 293K. One can convert a temperature in Celsius to kelvin by adding 273 to it and vice versa.

Answer to Problem 6E

400K is hot.

Explanation of Solution

To convert a temperature in Kelvin to Celsius one can simply subtract 273 from temperature in Kelvin.

On the Celsius scale, 400K is $400-273=127{}^{\text{o}}\text{C}$

Since, boiling point of water is 100 ^oC thus, 127 ^oC is hot.