Question

thermometers are used to measure the temperature of something. thermometers can measure the temperature of solids, liquids, and gases. it is a very useful tool! celsius is a unit of measure used around the world. on this thermometer, the unit of measure is celsius (c). the division between units is 2 degrees celsius (2c).
what is the measurement shown above?
______ c
how many significant digits does the measure have?
______

Explanation:

First Sub - Question: What is the measurement shown?

Step1: Identify the base and interval

The thermometer has major marks at 10°C, 20°C, 30°C. The division between units is 2°C. Between 10°C and 20°C, there are 5 intervals (since from 10 to 20 is 10°C, and each interval is 2°C, 10/2 = 5). Wait, actually, looking at the thermometer, the mark for 20°C, then the next marks: from 20°C, each small mark is 2°C? Wait, no, the problem says "the division between units is 2 degrees Celsius (2°C)". Wait, the major units are like 10, 20, 30, and between them, the division (the space between two adjacent small marks) is 2°C. Wait, looking at the thermometer, the red line is at 16°C? Wait, no, let's re - examine. Wait, from 10°C to 20°C: how many small marks? Let's count. From 10 to 20, if each division is 2°C, then the number of intervals between 10 and 20: (20 - 10)/2=5 intervals? Wait, no, maybe the major marks are 10, 20, 30, and between 10 and 20, there are 5 small marks? Wait, no, the problem says "the division between units is 2 degrees Celsius". So between two major units (like 10 and 20), the difference is 10°C, and each small division is 2°C. So from 20°C, going down: 20 - 2 = 18, 20 - 4 = 16? Wait, no, the red line is at 16? Wait, no, let's see: the 20°C mark, then below it, how many marks? Wait, the thermometer shows that the red column is at 16? Wait, no, maybe I made a mistake. Wait, the major marks: 10, 20, 30. The division between units (small divisions) is 2°C. So from 10 to 20: 10°C range, with each small division 2°C, so number of small divisions between 10 and 20 is 10/2 = 5. Wait, but the red line is at 16? Wait, no, let's count from 20°C down. 20 - 2 = 18, 20 - 4 = 16. Wait, the red line is at 16°C? Wait, no, maybe the correct way: the mark for 20°C, then the next mark below it (towards 10°C) is 18°C, then 16°C. Wait, the red line is at 16°C? Wait, no, let's check the problem again. Wait, the problem says "the division between units is 2 degrees Celsius (2C)". So each small mark is 2°C. So from 10°C, each small mark is +2°C. So 10, 12, 14, 16, 18, 20. Ah! So between 10 and 20, the small marks are 12,14,16,18. Wait, no, 10 + 2 = 12, 12+2 = 14, 14 + 2=16, 16+2 = 18, 18+2 = 20. So the red line is at 16°C? Wait, no, looking at the thermometer image (as described), the red column is at 16? Wait, no, maybe I messed up. Wait, the correct answer: let's see, the 20°C mark, then three small marks down (each 2°C) would be 20 - 2*3 = 14? No, this is confusing. Wait, maybe the thermometer has the following: the major ticks at 10, 20, 30. The minor ticks (divisions) are 2°C each. So from 20°C, moving down (towards 10°C), the first minor tick is 18°C, the second is 16°C, the third is 14°C, the fourth is 12°C, the fifth is 10°C. Wait, the red line is at 16°C? Wait, no, maybe the answer is 16? Wait, no, let's do it properly. The formula: Let the base be 10°C, and the number of intervals above 10°C. Wait, no, the red line is between 10 and 20. Let's count the number of small divisions from 10°C. Each division is 2°C. From 10°C, the first division: 10 + 2 = 12, second:14, third:16. So the red line is at 16°C? Wait, yes, that makes sense. So the temperature is 16°C.

Step2: Confirm the calculation

Since each small division is 2°C, and from 10°C, we have 3 divisions (10 + 23 = 16), or from 20°C, we have 2 divisions down (20 - 22 = 16). So the temperature is 16°C.

Second Sub - Question: How many significant digits?

Step1: Recall significant digit rules

Significant digits: non - zero digits are significant. 16 has two non - zero digits, 1 and 6. So the number of significant digits is 2.

Answer:

First answer: 16
Second answer: 2