In which of the following, heat loss is primarily not due to convection? निम्नलिखित में से किसमें ऊष्मा की हानि मुख्य रूप से संवहन के कारण नहीं होती?

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In which of the following, heat loss is primarily not due to convection? निम्नलिखित में से किसमें ऊष्मा की हानि मुख्य रूप से संवहन के कारण नहीं होती?