Primary radical
穴 is the Unicode primary radical used to organise 空.
穴 is the Unicode primary radical used to organise 空.
工 is recorded as the sound-side component in this pictophonetic analysis.
Each square adds one stroke in the standard writing order.
HSK 3 · air conditioning; air conditioner (including units that have a heating mode)
HSK 4 · empty; air; sky; in vain; to empty; vacant
HSK 4 · air; atmosphere
HSK 4 · empty; air; sky; in vain; to empty; vacant
HSK 5 · space; room; (fig.) scope; leeway; (astronomy) outer space; (physics, math.) space
HSK 5 · in the sky; in the air
hollow, empty, deserted, bare
空 has 8 strokes. Follow the animated stroke-order sequence above, then practise it on the writing page.
穴 is the radical in 空. It can provide a meaning-side clue.
空调 (kōngtiáo): air conditioning; air conditioner (including units that have a heating mode); 空 (kōng): empty; air; sky; in vain; to empty; vacant; 空气 (kōngqì): air; atmosphere.