It is nice when it is hot, isn’t it?
I’d like to ask you about the usage of the underlined “it.” Is there any name for this particular usage?
If "it" does not refer to anything specific, but exists only to satisfy the grammar, then it is called a "dummy 'it'". g. it could refer to your bath water or your rice pudding), but I suppose, from the nature of your question, it probably is.
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If "it" does not refer to anything specific, but exists only to satisfy the grammar, then it is called a "dummy 'it'". Without more context it is not possible to be sure whether your "it" is a dummy "it" (e.g. it could refer to your bath water or your rice pudding), but I suppose, from the nature of your question, it probably is.