Question

In Hope’s apparatus when the temperature of water drops from 4ºC to 3ºC,

water .................. .

(a) Remains still (b) moves upwards

(c) moves downwards (d) freezes solid

Answer 1

In Hope’s apparatus when the temperature of water drops from 4ºC to 3ºC, water b)moves upward.

It is because, when the temperature falls below 4°C, the water starts expanding, its density decreases and hence it moves upward. water has maximum density at 4°C since

density = mass/volume,

so water has minimum volume at 4°C, any drop in temperature further will cause expansion of water.

Answer 2

Option D is the correct option of this question.

Hope’s mechanical assembly is a glass barrel enclosed with a trough most of the way up to contain a solidifying blend. Openings in the chamber at the best and the base enable thermometers to be embedded into the water to test its temperature.  

Thomas Charles Hope FRSE FRS PRCPE FFPSG was a Scottish doctor, scientific expert and speaker. He demonstrated the presence of the component strontium, and gave his name to Hope's Experiment, which demonstrates that water to come into strong shape when temperature tumbles down