It’s been very hot and humid these days like we are in a boiling pot in Japan… I’m scared whether I can survive this summer…
Well, when something is hot we say 暑い or 熱い – both are pronounced “atsui”. What’s the difference? In Japanese 暑い is used for climate. Like I said at the beginning, when we describe an air temperature is hot we write and use 暑い.
About the other things, we write 熱い.
Like hot body, hot pan, hot water, things you can touch, are described 熱い.
Theses are usual expressions like you can use in a formal occasions, but when it comes to casual occasions you can also use 暑っつ / 熱っつ : both are pronounced as a–tsu.
Like saying “watch”, tiny ”っ” has actually no sound and it needs a very little interval between あ”a” and つ “tsu”.
Hope this article help you.