Spontaneous heating of coal rapidly...

Question 1 / 2707066636ee728f7522a1c518a17

Question 1 of 2707066636ee728f7522a1c518a17

Spontaneous heating of coal rapidly accelerates at the approximate minimum temperature of __________.

Question 1 of 27070

Spontaneous heating of coal rapidly accelerates at the approximate minimum temperature of __________.

🔍 Key Concepts

• Spontaneous heating of coal and what causes it • The typical temperature range at which oxidation of coal becomes dangerously rapid • Differences between slow oxidation at lower temperatures and rapid self-heating at higher temperatures

💭 Think About

• Which of these temperatures is warm enough that chemical reactions (oxidation) in coal would speed up significantly, rather than just slowly smoldering? • Think about common guidance for coal cargoes: at about what temperature do shipboard monitoring procedures usually become more urgent or trigger additional precautions? • Among the options, which value best matches a threshold where the risk changes from "monitor" to "potentially dangerous" for self-heating?

✅ Before You Answer

• Compare the choices to normal ambient temperatures in cargo holds and tropical climates; which value clearly stands above normal ambient conditions? • Recall that many safety guidelines start paying close attention when temperatures exceed about 40–50° C (104–122° F)—which option is closest to the low end of that range without being extremely high? • Eliminate any temperature that is so low it might often be reached in a cool cargo hold without causing serious concern for spontaneous heating.

Question 1 of 27070

Spontaneous heating of coal rapidly accelerates at the approximate minimum temperature of __________.

88° F

111° F

100° F

119° F

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Question 1 / 2707066636ee728f7522a1c518a17

Question 1 of 2707066636ee728f7522a1c518a17

Spontaneous heating of coal rapidly accelerates at the approximate minimum temperature of __________.

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Question 1 of 27070

Spontaneous heating of coal rapidly accelerates at the approximate minimum temperature of __________.