What is Relative Humidity?

What is Relative Humidity?

So first of all, what is Relative Humidity?

Humidity in general simply means that the air contains water vapour. So, if we say that the air is humid, it contains moisture, otherwise, it is dry. But relative humidity gives the percentage of water vapour in the air for a particular temperature. It is defined as the ratio of the amount of water vapour present in the air to the amount of water vapour required to saturate it or the maximum amount of water vapour it can hold at that temperature. Relative humidity (RH) can change depending on the temperature; warm air holds more moisture than cold air.

What and who can it effect?

Typically we see humidity measurement requests come from those in medical and heritage sectors. Medicines and heritage artefacts such as paintings are heavily dependant on measurement techniques. The environment in which these items are stored can affect the level of deterioration that occurs. Monitoring these environments using highly accurate humidity sensors can assist users in identifying any problem areas where goods and artefacts may be at risk.

ML4000 temperature and humidity data

Humidity measurement

Measurement of humidity can be achieved by using temperature and humidity data loggers or radio transmitters. Ensure that units you choose are accurate and highly recommended before relying on them for your critical goods.

Whilst measurement is critical, action may also be required, if monitoring is required out of hours, ensure a wireless system is in place for SMS alerts. Data loggers are good for a record of data, but only show a retrospective view of data – the damage is already done.

Radio transmitters such as Hanwell’s ML4000 range can be used in conjunction with humidifiers and dehumidifiers to provide automated control of critical environments.

Ask Hanwell for more details on humidity measurement and control, or click here for more information about our humidifiers and dehumidifiers.