This is the 1299th most frequent Japanese word.
熱い
"熱い" means "hot" (referring to temperature).
In this sentence, '熱い' is used to describe the temperature of the soup, indicating that it is hot in temperature.
このスープはとても熱いです。
This soup is very hot.
Here, '熱い' is used metaphorically to describe the fervor or passion of the feelings being conveyed.
彼は熱い思いを語った。
He expressed his passionate feelings.
'熱い' in this sentence refers to the physical heat of the sand, emphasizing its high temperature.