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Questions and Answers
Can the sense of touch be used reliably to measure the temperature of an object?
Can the sense of touch be used reliably to measure the temperature of an object?
False
What is heat?
What is heat?
What is a thermometer used for?
What is a thermometer used for?
measuring the temperature of an object
Match the temperature scale with its description:
Match the temperature scale with its description:
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The normal human body temperature is ___ °C.
The normal human body temperature is ___ °C.
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The Kelvin scale was proposed by William Thomson (Lord Kelvin) in 1848.
The Kelvin scale was proposed by William Thomson (Lord Kelvin) in 1848.
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What is the freezing point of water in Kelvin according to the Kelvin scale?
What is the freezing point of water in Kelvin according to the Kelvin scale?
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Which types of thermometers are mentioned in the content? (Select all that apply)
Which types of thermometers are mentioned in the content? (Select all that apply)
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Convert 37 °C into degrees Fahrenheit using the given formula: $T_F = (T_C \times 180) + 32$
Convert 37 °C into degrees Fahrenheit using the given formula: $T_F = (T_C \times 180) + 32$
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Convert 50 °C into the Kelvin scale using the formula provided.
Convert 50 °C into the Kelvin scale using the formula provided.
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Study Notes
Temperature
- Heat is a form of energy that is used in various ways in daily life, including keeping us warm in winters and cooking food.
- Heat causes hotness or coldness in an object, and temperature is a measure of this hotness or coldness.
Effects of Heat
- When heat is given to an object, its temperature rises, making it hot.
- When heat is removed from an object, its temperature decreases, making it cold.
Measuring Temperature
- The sense of touch is not reliable for measuring temperature.
- A thermometer is a device used to measure the temperature of an object accurately.
Thermometer
- A thermometer is a long cylindrical tube with a scale and mercury inside.
- When a thermometer comes into contact with an object, the mercury expands and rises to a point on the scale, indicating the temperature of the object.
Temperature Scales
- There are three major types of temperature scales: degree Fahrenheit (°F), degree Celsius (°C), and Kelvin scale (K).
- Degree Celsius and degree Fahrenheit scales are commonly used, while the Kelvin scale is used in scientific work.
Celsius Scale
- The degree Celsius scale was developed by Anders Celsius.
- The lower fixed point is 0 °C (freezing point of pure water), and the upper fixed point is 100 °C (boiling point of pure water).
- The scale is divided into 100 equal divisions, with each division called one degree Celsius (°C).
- The normal human body temperature is 37 °C.
Fahrenheit Scale
- The Fahrenheit scale was invented by Daniel Gabriel Fahrenheit.
- The lower fixed point is 32 °F (freezing point of pure water), and the upper fixed point is 212 °F (boiling point of pure water).
- The scale is divided into 180 equal divisions, with each division called one degree Fahrenheit (°F).
Types of Thermometers
- There are three main types of thermometers: clinical thermometer, laboratory thermometer, and digital thermometer
Progress Check
- No specific notes required for this section
Kelvin Scale
- The Kelvin scale was proposed by William Thomson (Lord Kelvin) in 1848
- On the Kelvin scale, 273.15 K is the freezing point of water and 373.15 K is the boiling point of water
- There are 100 divisions between the freezing point and boiling point of water on the Kelvin scale
- Each division on the Kelvin scale is equal to 1 Kelvin (K), which is the SI unit for measuring temperature
- The formula to convert between temperature scales is: TC=TF−32180=TK−273.15100T_C = \frac{T_F - 32}{180} = \frac{T_K - 273.15}{100}TC=180TF−32=100TK−273.15
- The formula can be used to convert between Celsius, Fahrenheit, and Kelvin scales
- Examples of temperature conversions:
- Normal human body temperature (37 °C) is equivalent to 98.6°F
- 50 °C is equivalent to 323.15 K
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Description
Understand the concept of heat energy and its relation to temperature. Learn how heat is used in daily life and how it affects objects.
