Fill in the empty cells of the observation table for daily air temperature, if it is known that at 6:00 the lowest air temperature was recorded, and at 14:00 - the highest. Write the air temperature values as whole numbers.

Analysis of the Thermometers:

• The first thermometer shows a temperature of -20°C (the mercury level is at the -20 mark).
• The second thermometer shows a temperature of -10°C (the mercury level is between -10 and -20, closer to -10).
• The third thermometer shows a temperature of 10°C (the mercury level is at the 10 mark).

Filling the Table:

Based on the problem statement:

• The lowest temperature was at 6:00. From the thermometers, the lowest is -20°C.
• The highest temperature was at 14:00. From the thermometers, the highest is 10°C.
• The temperature at 10:00 is -10°C (from the second thermometer).

Therefore, the completed table is:

Ответ: Заполненная таблица: 6:00 -20 °С, 10:00 -10 °С, 14:00 10 °С.