小阳同学利用物理实验室提供的天平和水（水的密度已知），测出了墨水瓶的容积．请写出小阳的测量方法，并用测量出的数据（用字母表示）写出墨水瓶容积的表达式．
测量方法：
墨水瓶的容积表达式：
用天平称出空瓶的质量m瓶，再称出装满水的质量m总，就可求出水的质量m水，即m水=m总-m瓶，
由密度公式就可算出水的体积即瓶子的容积，即V水=V瓶=
=m水 ρ水
．m总-m瓶 ρ水
故答案为：
．m总-m瓶 ρ水
| 用所给词或词组的正确形式填空（每个只能用一次，其中有三项是多余的）。 | |
2. John and Jack are both seven. They are ________________. 3. The ________________ contains hundreds of letters. 4. Shall I ________________ at the next stop? 5. He can't do it himself. Will you please help ________________? 6. Where is Mike? He ________________ under the tree. 7. My brother ________________ to school in the morning. 8. We ________________ on the coming Children's Day. 9. Last week, we went to the farm and ________________ carrots there. 10. There is a new supermarket near my home. The ________________ in it are beautiful and delicious. |