To measure exactly 55ml of water, you can use a graduated cylinder or a measuring cup that has milliliter markings. If you have a 100ml graduated cylinder, you can pour water until it reaches the 55ml line. Alternatively, if you have a measuring cup with milliliters marked, fill it up to the 55ml mark. For precision, make sure to read the measurement at eye level to avoid parallax error.
To measure exactly 85ml of water, you can apply the same methods. Again, a graduated cylinder or a measuring cup with milliliter markings is perfect. If you only have a 100ml graduated cylinder, fill it to the 85ml line. In case you don’t have such a tool, you can use a combination of smaller measuring tools; for example, you could use a 50ml cup plus a 35ml cup to achieve the desired measurement.
In general, graduated cylinders and measuring cups are the most straightforward tools for accurately measuring liquid volumes in milliliters.