# Can heat capacity be zero?

## Can heat capacity be zero?

Yes, the specific heat capacity can be zero or infinite. Specific heat capacity is defined as the amount of heat energy required to raise the temperature of unit mass of the substance through 1°C or 1 K.

## Why is my specific heat capacity negative?

Negative heat capacity would mean that when a system loses energy, its temperature increases.

## Is heat can be negative?

Negative heat capacity Most physical systems exhibit a positive heat capacity. However, even though it can seem paradoxical at first, there are some systems for which the heat capacity is negative. A negative heat capacity can result in a negative temperature.

## How do you calculate CP of air?

Note!

1. For ordinary calculations – a value of specific heat cp = 1.0 kJ/kg K (equal to kJ/kg oC) or 0.24 Btu(IT)/lb °F – is normally accurate enough.
2. For higher accuracy – a value of Cp = 1.006 kJ/kg K (equal to kJ/kg oC) or 0.2403 Btu(IT)/lb °F – is better.

## What is the standard value of CP for air?

Table of specific heat capacities

Substance Phase Isobaric mass heat capacity cP J⋅g−1⋅K−1
Air (Sea level, dry, 0 °C (273.15 K)) gas 1.0035
Air (typical room conditionsA) gas 1.012
Aluminium solid 0.897
Ammonia liquid 4.700

## Is air an ideal gas?

Actually there is no “real” gas that is truly an ideal gas. At STP (Standard Temperature and Pressure) air and most pure gasses will behave closely enough to an ideal gas that the ideal gas law can be used. At high temperature and low pressure gasses behave more like an ideal gas.

## Why air is treated ideal gas?

Any gas behaves as an ideal gas under high temperature an low pressure. Atmospheric oxygen is at 25deg celcius which is greater than it’s critical temperature which is -150 deg celcius. And the pressure is somewhere around 159 mm of Hg (21.1 kPa). Hence atmospheric gases is said to behave like that of an ideal gas.

## Why are real gases not ideal?

At relatively low pressures, gas molecules have practically no attraction for one another because they are (on average) so far apart, and they behave almost like particles of an ideal gas. At higher pressures, however, the force of attraction is also no longer insignificant.

## What is M in the ideal gas law?

m = mass [kg], [slugs] R = individual gas constant [J/kg K], [ft lb/slugs oR] T = absolute temperature [K], [oR]

## How do you calculate R in PV nRT?

The ideal gas law is: pV = nRT, where n is the number of moles, and R is universal gas constant. The value of R depends on the units involved, but is usually stated with S.I. units as: R = 8.314 J/mol·K.

## What is a real life example of ideal gas law?

Ideal gas laws are used for the working of airbags in vehicles. When airbags are deployed, they are quickly filled with different gases that inflate them. The airbags are filled with nitrogen gases as they inflate.

## What is a real life example of combined gas law?

One example of the combined gas law applies to scuba diving. In scuba divers, human lungs are the container that hold the gas. The pressure in water is greater than pressure in air, and water pressure increases with depth. With each additional foot that divers descend, water pressure rises.

## How does Boyle’s law apply to everyday life?

You can observe a real-life application of Boyle’s Law when you fill your bike tires with air. When you pump air into a tire, the gas molecules inside the tire get compressed and packed closer together. This increases the pressure of the gas, and it starts to push against the walls of the tire.

## What is a real life example of Charles Law?

Tyres of untouched vehicles get deflated during freezing winter days while get inflated in hot summer days. This unusual behaviour is because of Charles’s law. In winter due to low temperatures, the air inside a tyre gets cooler, and they shrink. While in hot days, the air expands with temperature.

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