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Chapter 24: Problem 21

Which method of heat exchange occurs during direct contact between the source and the animal? a. radiation b. evaporation c. convection d. conduction

Short Answer

Expert verified
d. conduction

Step by step solution

01

Define heat exchange methods

Understand the different methods: Radiation is energy transfer through electromagnetic waves, evaporation is heat loss through liquid turning to gas, convection is heat transfer via fluid movement, and conduction is heat transfer through direct contact.
02

Identify key information

The problem specifies heat exchange occurring during direct contact between the source and the animal. Focus on the method that directly involves physical touch.
03

Match method to description

Since conduction is the transfer of heat through direct contact, it is the method that fits the description of direct physical interaction.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Radiation
Radiation is a method of heat exchange where energy is transferred through electromagnetic waves.

Think of the warmth you feel from the sun; that is radiation at work.
It does not require any medium (like air or water) to transfer heat.
This is why you can feel the sun's heat even in space.

Key aspects of radiation:
  • Energy transfer through electromagnetic waves
  • Does not require a medium
  • Examples include sunlight and heat from a fire
It is essential to recognize that radiation can occur without direct contact or even without matter between the heat source and receiver.
Evaporation
Evaporation is a process where heat is lost as liquid turns into gas.

This is a common method used by animals and humans to cool down.
For instance, when you sweat, the liquid sweat evaporates off your skin, taking heat away and cooling you down.

Key aspects of evaporation:
  • Heat loss through liquid turning to gas
  • Common in human and animal cooling mechanisms
  • Requires energy to change the state from liquid to gas
Evaporation plays a crucial role in maintaining body temperature, especially in hot environments. It ensures that excess heat is efficiently removed from the body.
Convection
Convection is the transfer of heat through the movement of fluids such as air or water.

This process involves the fluid moving around and distributing heat.
For example, when you boil water, the heat from the stove is transferred to the pot, and the water particles start to move, creating a convection current.

Key aspects of convection:
  • Heat transfer via fluid movement
  • Works in liquids and gases
  • Examples include boiling water and warm air circulation in a room
Convection is essential in natural processes such as ocean currents and atmospheric circulation, contributing to the earth鈥檚 climate and weather patterns.
Conduction
Conduction is the process of heat transfer through direct contact.

In this method, heat moves from the hotter object to the cooler one via physical touch.
For example, when you touch a hot metal spoon, the heat is conducted from the spoon to your hand.

Key aspects of conduction:
  • Heat transfer through direct contact
  • Requires physical touch between objects
  • Examples include a warm hand touching an ice cube and heat moving through a metal rod
Conduction is the primary method of heat transfer when there is direct contact, such as an animal resting on a warm surface. It ensures that heat moves efficiently between objects touching each other.

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Most popular questions from this chapter

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Which of the following statements most directly supports the claim that different species of organisms use different metabolic strategies to meet their energy requirements for growth, reproduction, and homeostasis? a. During cold periods, pond-dwelling animals can increase the number of unsaturated fatty acids in their cell membranes, while some plants make antifreeze proteins to prevent ice crystal formation in tissues. b. Bacteria lack introns, while many eukaryotic genes contain many of these intervening sequences. c. Carnivores have more teeth that are specialized for grinding food. d. Plants generally use starch molecules for storage while animals use glycogen and fats for storage.

Which type of animal maintains a constant internal body temperature? a. endotherm b. ectotherm c. poikilotherm d. fusiform
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