Question

Q4. what are the thermometers which were used in the past. On
which principles where they based? What were their advantages and
disadvantages? Why are they not used nowadays? Prepare a project report on the
same.​

Answer 1

Answer:

As used now, but in a different form, mercury was also used in olden time thermometers. Thermoscopes were used which only showed the rise in temperature but no numerical values.

Explanation:

On what principle were the made?

The device was built from a small vase filled with water, attached to a thin vertically rising pipe, with a large empty glass ball at the top. Changes in temperature of the upper ball would exert positive or negative pressure on the water below, causing it to rise or lower in the thin column.

What were their advantages and Disadvantages?

ADVANTAGES:

1. Cheap

2. Durable

3. Can be used on a Thermograph

4. Easily calibrated

DISADVANATGES:

1. requires frequent calibration to maintain accuracy

2.fairly slow response

Why are they not used today?

When we rub the glass tube again, the air inside would heat up, and the water level in the tube would slowly drop because the warmer air took up more space than the cooler air. Although the increase and decrease could be seen, the thermoscope could not measure the degree of the change in a mathematical way.

Answer 2

Answer:

as usd now, but in a differen form, mercury was also an olden time only stowed the thermometer, Thermoscopes were used which ise in tempresature but no numerical valu

:- On what principle with

were

the made

The denice was build from a small ware filled with water, attached.

& a thin undically rising pips, with a temprature of the upper ball walk exert positive or negative prower on the water below, causing! to ris or lower in the thin too cullams

What were advantages and Disadvantages ?

Advantages: -

3) Cheap

2) Durable

3) can be used on a thermograph

4 easily calibrated

disadvantages:

3). require frequent calibration to maintain accuracy

2). fairly show response

:- Why are the not used today

When we rub the glass tuber again, the air inside would heat up, and the water devel in the tube would slow drob because

the warmer air look up more space than the cooler air. Although the increase and decrease could be sun, the therm scope could not measure the degree of the change in a mouth mathematical