## Does the specific heat of water vary with temperature?

Specific heat capacity often varies with temperature, and is different for each state of matter. Liquid water has one of the highest specific heat capacities among common substances, about 4184 J⋅kg−1⋅K−1 at 20 °C; but that of ice, just below 0 °C, is only 2093 J⋅kg−1⋅K−1.

## What is specific heat of water at different temperatures?

Temperature Isochoric Specific Heat (Cv) Isobaric Specific Heat (Cp)
[°F] [Btu(IT)/(mol °R)] [kJ/kg K]
50 39.8 4.196
60 39.6 4.189
80 39.2 4.181

How accurate are forehead temp checks?

But the temperature readings vary depending on which one you use, and you need an accurate body temperature to determine if a fever is present. A forehead (temporal) scanner is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature.

What is the enthalpy of water at room temperature?

For saturated water at standard atmosphere – 2) -the specific enthalpy – hf – is 419 kJ/kg.

### Does specific heat capacity of water change with pressure?

For water and most solids/liquids, yes but very slightly. When you heat the water it expands, which does work against the surrounding pressure.

### Does specific heat of water change with pressure?

For water and most solids/liquids, yes but very slightly. When you heat the water it expands, which does work against the surrounding pressure. At higher pressure, the expansion takes more work.

What is a normal forehead temperature?

The average body temperature is 98.6 F (37 C). But normal body temperature can range between 97 F (36.1 C) and 99 F (37.2 C) or more.

Why is my temperature different on each side of forehead?

At times, you can expect larger differences from temperatures taken at other body sites. This is because of two main reasons: Temporal artery temperature changes faster than a temperature taken rectally. Temporal artery temperature is not affected by the things that cause oral and underarm temperatures to be misleading …

#### What is entropy and enthalpy?

Enthalpy is the amount of internal energy contained in a compound whereas entropy is the amount of intrinsic disorder within the compound.

#### Why is Q MC ∆ T used?

The quantitative relationship between heat transfer and temperature change contains all three factors: Q=mcΔT Q = mc Δ T , where Q is the symbol for heat transfer, m is the mass of the substance, and ΔT is the change in temperature. The symbol c stands for specific heat and depends on the material and phase.

What is the specific enthalpy and entropy of water?

For full table with Entropy – rotate the screen! Specific enthalpy and entropy for liquid water at temperatures from 32 to 675 °F: For full table with Entropy – rotate the screen!

How to calculate the specific heat capacity of water?

This value for Cp is actually quite large. This (1 cal/g.deg) is the specific heat of the water as a liquid or specific heat capacity of liquid water. One calorie= 4.184 joules; 1 joule= 1 kg (m)2(s)-2 = 0.239005736 calorie. The specific heat capacity of water vapour at room temperature is also higher than most other materials.

## When does the enthalpy of evaporation become zero?

This point occurs at a pressure of 221.2 bar (22.12 MN/m^2) and a temperature of 374.15° C. It will be noticed that as the pressure increases towards the critical pressure, the enthalpy of evaporation (latent heat) reduces until it fmally becomes zero at the critical point.

## How are the enthalpy points of a temperature graph related?

Figure shows temperature – enthalpy graph drawn for a wide range of pressures. If all the liquid enthalpy (sensible heat) points obtained at different temperatures are joined we get ‘saturated liquid line’. If all the dry saturated steam points are joined by means of a smooth curve we get a `saturated vapour line’.