# Which thermometer first shows a decrease in temperature and why?

## Which thermometer first shows a decrease in temperature and why?

Thermometer B. It is because, as the water in the region of freezing mixture, falls in temperature, its volume decreases, its density increases and hence it sinks down.

### When a thermometer is heated the red liquid inside the thermometer moves up?

a. Why does the red liquid move up the tube when a thermometer is heated? When heated, the molecules in the liquid inside the thermometer get a little further apart. Because the liquid takes up more space, the red line moves up in the tube.

Why thermometer should not be shaken rigorously to lower the reading to zero before using it?

Shaking the thermometer hard is what gets the mercury down and ultimately drives it through the constriction so that it rejoins into a single column. In effect, you are making the glass accelerate so fast that it leaves the mercury behind.

Why is it important to use the same thermometer?

When temperature changes are being measured, one can reduce the error by taking both temperatures with the same thermometer. In this experiment the accuracy of two thermometers is investigated by observing their readings at the ice point and at the boiling point of water.

## What is the difference between temperature and thermometer?

Answer: Temperature is the physical quantity which judge the environment whether it is hot or cold , whereas, Thermometer is a device which is associated with temperature i.e., it is a device to measure the temperature whether it is hot or cold .

### Who invented the doctor’s thermometer?

Sir Thomas Clifford Allbutt (1836–1925) was a celebrated British physician. He spent 20 years working in Leeds during which time he devised the small clinical thermometer.

What would cause the liquid in the thermometer to drop?

A thermometer is placed in water in order to measure the water’s temperature. What would cause the liquid in the thermometer to drop? The kinetic energy of the water molecules decreases.

What is the liquid inside the thermometer?

In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.

## What can bring the level of mercury down?

We can use a thermometer in the following way: Wash the thermometer, preferably with an antiseptic solution. Hold it firmly and give it a few jerks. The jerks will bring the level of mercury down.

### What is the most reliable thermometer?

The best thermometers of 2021

• Braun Digital No-Touch Forehead Thermometer. Best thermometer overall.
• Elepho eTherm Infrared Ear & Forehead Thermometer. Best thermometer for travel.
• Vicks ComfortFlex Digital Thermometer. Best affordable thermometer.

What thermometer do doctors recommend?

Best thermometer overall: iProven Forehead and Ear Thermometer DMT-489. Best thermometer on a budget: Vicks Comfort Flex Thermometer. Best infrared non-contact thermometer: iHealth No-Touch Forehead Thermometer PT3. Best thermometer for daily testing: Kinsa Quick Care Smart Thermometer.

What does a faulty thermometer read in ice?

A faulty thermometer reads 5∘C in melting ice and 99∘C in dry steam. Find the correct temperature in Fahrenheit scale if this faulty thermometer reads 52∘C . ×100. Where, t = actual reading.

## How often do you record the melting point of ice?

Read the thermometer reading and record the temperature after every 1 minute till the ice melts and the thermometer reading remains stationary for 2 minutes. Note the readings in the observation table.

### Which is the correct temperature in ice and steam?

A faulty thermometer reads 5^∘ C in melting ice and 99^∘ C in dry steam. Find the correct temperature in Fahrenheit scale if this faulty thermometer reads 52^∘ C . A faulty thermometer reads 5∘C in melting ice and 99∘C in dry steam. Find the correct temperature in Fahrenheit scale if this faulty thermometer reads 52∘C .

Where are the thermometers kept in a laboratory?

9. A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in Figure 4.5. Which of the thermometers, A or B, will show a greater rise in temperature?