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Awọn iwọn olopupọ

Awọn oluwo ojo fi olopupọ wera pẹlu awọn nkan ojoojumọ. Iṣẹ Ojo Orilẹ-ede lo awọn iwọn wọnyi ninu awọn ijabọ rẹ; olopupọ 1 inch (iwọn quarter) tabi ju bẹẹ lọ jẹ severe.

Ìwọ̀n ìjì	Millimeters	Fi wera pẹlu	Severe
0.25 in	6 mm	èso pea
0.5 in	13 mm	bọ́ọ̀lù marble
0.75 in	19 mm	owó 1-cent
0.88 in	22 mm	owó 5-cent
1 in	25 mm	owó 25-cent	✓
1.25 in	32 mm	owó 50-cent	✓
1.5 in	38 mm	bọ́ọ̀lù ping pong	✓
1.75 in	44 mm	bọ́ọ̀lù golf	✓
2 in	51 mm	ẹyin àgbò	✓
2.5 in	64 mm	bọ́ọ̀lù tennis	✓
2.75 in	70 mm	bọ́ọ̀lù baseball	✓
3 in	76 mm	ikò tii	✓
4 in	102 mm	èso grapefruit	✓
4.5 in	114 mm	bọ́ọ̀lù softball	✓

Olopupọ ti o to 1 inch le ba awọn ọkọ ayọkẹlẹ jẹ ati ba awọn shingles atijọ jẹ; olopupọ iwọn golf-ball (1.75 in) ati ju bẹẹ lọ ma n fọ awọn ferese, skylights ati siding. Iye iparun ti ojo ṣe tun da lori afẹfẹ ati ọjọ ori ilé.