The mass of the water will not change due to temperature. Flow meters usually measure the volume of liquid that flows per unit time. The mass that flows is that volume times the density; the density changes with the temperature, so the mass flow rate also does.

Figure 2: When the freshwater ice melts, it raises the water level. Freshwater is not as dense as saltwater; so the floating ice cube displaced less volume than it contributed once it melted. When ice on land slides into the ocean, it displaces ocean water and causes sea level to rise.

If we apply this information to the cups, the cup of water and the cup of ice have the same mass, i.e. amount of “stuff.” Because they had the same amount of “stuff,” they have the same weight. As water freezes it expands. So, ice has more volume (it takes up more space, but has less density) than water.

It takes less energy to change the temperature of land compared to water. This means that land heats and cools more quickly than water and this difference affects the climate of different areas on Earth. Different energy transfer processes also contribute to different rates of heating between land and water.

During the day the land, which has a low specific heat and is a poor conductor, heats much more quickly than water. As the land warms up, the air next to it heats by conduction and rises, warming the air above the land by convection.

So, specific heat capacity of the water is higher compared to land. So, it takes much time for the heat to heat up the water than land. During night time, the heat received by the land is reflected back into the atmosphere. So, as the result it loses more heat quicker than the water during this time.

Compared to air or land, water is a slow conductor of heat. That means it needs to gain more energy than a comparable amount of air or land to increase its temperature. That means that, once heated, a body of water will hold onto that heat for a much longer period of time than either air or land.

Water is a slow conductor of heat, thus it needs to gain more energy than the sand or dry land in order for its temperature to increase. On the other hand, soil loses its heat much faster. Water has to lose more energy than the sand (dry land) in order for the temperature to decrease.

Heat transfer, thus, is dictated by surface area. If we assume that the two bodies of water have minimal surface area (Which can be proven to be a sphere) then the larger body of water has a greater surface area, and thus will lose heat faster. It’ll take longer to cool, even though it’s losing heat faster.

50–45 20 min, but you said open pot, so it’s faster, as you get material loss (evaporation/”sensible heat”) as the water cools.

Larger objects will lose heat more quickly. Larger objects will however lose temperature more slowly, as the heat needed to cool them by 1° is proportional to their volume, a cubic function of their size, for the same material and the same shape and the same ambiant conditions.

Claim: The cool air in the room gains heat. Evidence: The temperature of air in the room increases after some time. Reason: The temperature of the air in the room increases when heat is gained by the air. When an object gains heat, its temperature increases.

The surface area to volume ratio of an object changes as you change the scale. For instance, smaller objects cool more quickly than larger objects of the same shape because they have proportionally more surface area to cool from. Bigger objects rust more slowly than smaller objects with the same shape.