Final answer:
The scientist's tube holding 1.9×10³ mL of solution is equivalent to 1,900 mL when expressed in standard notation.
Step-by-step explanation:
The scientist's tube holds 1.9×10³ milliliters (mL) of solution. To express this value in standard notation, you replace the exponential notation with the actual number it represents. The number 1.9×10³ means 1.9 times 10 to the third power, which is equivalent to 1.9 times 1,000.
To find the standard notation, you calculate 1.9 × 1,000 which equals 1,900. So, the scientist's tube with 1.9×10³ mL of solution equates to 1,900 mL in standard notation.
Converting and understanding units is an essential skill in the sciences for accurate measuring and reporting.