20 liters
cups
The most reasonable unit of capacity for a bathtub is typically measured in gallons or liters. This measurement helps determine the amount of water the bathtub can hold when filled to the desired level.
A "pitcher" is an indefinite capacity.
20 ml
A kilolitre or megalitre if a large pond.
The most reasonable unit of capacity to measure a can of applesauce would be either fluid ounces or milliliters. These units are commonly used for measuring liquids and can provide a precise measurement of the volume of the can.
Water pitchers are available in many sizes, so each will hold the amount of water it is made to hold. It could be a quart, pint, half gallon, or a gallon. Some may be even larger, depending on their intended uses.
The basic metric unit of measure for measuring the capacity of a pitcher is liters (L).
1 liter
The best unit of capacity to describe the amount of lemonade in a pitcher is liters or quarts, depending on the size of the pitcher. For example, if the pitcher holds 2 liters of lemonade, you would state that the capacity is 2 liters. To determine this, you can fill the pitcher with a known volume of water (like a liter measuring cup) and count how many times it fills the pitcher to find its total capacity. This approach provides a practical way to measure the volume of liquid accurately.
A test tube with a capacity of 200 mL is more reasonable for most laboratory applications as it is a common size for holding small volumes of liquid samples or reagents. A test tube with a capacity of 9 L would be significantly larger and not typically used in standard laboratory procedures.
Milliliters or fluid ounces would be reasonable metric units to measure the capacity of a drinking glass. These units are commonly used for measuring liquid volumes and would provide a clear indication of the glass's capacity.