Làm thế nào để đong được 15 ml nước từ BCĐ có GHĐ = 40ml , độ chia nhỏ nhất của bình là 5ml ?

các bạn có thể thấy hình chú cấu trúc trong bao nhiêu giây.

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những chữ i này kì lạ lắm.

Làm thế nào để đo thể tích của 1 giọt nc ?

Giúp với ạ!!! đang cần gấp 

Đầu tiên đổ nuóc vào lọ thuốc nhỏ mắt (có chia độ ) . Sau đó ta dốc nuóc xuống . Ta lấy GHĐ đem chia cho số lần dốc thì ta đuọc thể tích một giọt nuóc