water heating v time taken
Discussion
Lvapour,
There is a quantity known as the "specific heat" or "specific heat capacity" of any material. It's quoted in calories per kilogram per degree C (or F, if you must). That for water is, by definition in the International System of Units (aka metric system), ONE calorie per ONE kilogram per ONE degree C. It is thus that the quantity "Calorie" is defined, and it is a constant. There would be little point in such a standard if it wobbled about all over the place at different temperatures!
You may be confused by the "Latent Heat of Melting" and the "Latent Heat of Vapourisation" (I note your user name), which show that much heat may be applied to melting or vaporising material, inc. water, that will not change its temperature while either solid or liquid remain.
John
There is a quantity known as the "specific heat" or "specific heat capacity" of any material. It's quoted in calories per kilogram per degree C (or F, if you must). That for water is, by definition in the International System of Units (aka metric system), ONE calorie per ONE kilogram per ONE degree C. It is thus that the quantity "Calorie" is defined, and it is a constant. There would be little point in such a standard if it wobbled about all over the place at different temperatures!
You may be confused by the "Latent Heat of Melting" and the "Latent Heat of Vapourisation" (I note your user name), which show that much heat may be applied to melting or vaporising material, inc. water, that will not change its temperature while either solid or liquid remain.
John
Pvapour,
If the 'constant force' is a constant rate of energy input then the water temperature will rise at a variable rate as the specific heat capacity of water varies with temperature.
If the 'constant force' is an energy source at a constant temperature then the rate of temperature rise will fall as the differential temperature between the 'constant force' and the water will also fall.
Mike...
If the 'constant force' is a constant rate of energy input then the water temperature will rise at a variable rate as the specific heat capacity of water varies with temperature.
If the 'constant force' is an energy source at a constant temperature then the rate of temperature rise will fall as the differential temperature between the 'constant force' and the water will also fall.
Mike...
mike_knott said:
Pvapour,
If the 'constant force' is a constant rate of energy input then the water temperature will rise at a variable rate as the specific heat capacity of water varies with temperature
Worth noting that the effect is quite small, only ~0.8% over the range 0C to 100C. For many practical purposes it can be treated as constant.If the 'constant force' is a constant rate of energy input then the water temperature will rise at a variable rate as the specific heat capacity of water varies with temperature
Gassing Station | Science! | Top of Page | What's New | My Stuff