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  2. not solid and firm and therefore not strong, safe, or likely to last: That chair looks unstable to me. It is a poor and politically unstable society. Synonyms. shaky (WEAK) unsound (WEAK) An unstable person suffers from sudden and extreme changes in their mental and emotional state: emotionally unstable.

    • English (US)

      UNSTABLE meaning: 1. not solid and firm and therefore not...

  3. As adjectives the difference between unstable and stable is that unstable is having a strong tendency to change while stable is relatively unchanging, permanent; firmly fixed or established; consistent; not easily moved, altered, or destroyed.

    • What Do Stability and Instability Look like?
    • What Makes Air Stable Or unstable?
    • What Happens to Make Clouds Appear Different in Stable Or Unstable Conditions?
    • What Makes Air Rise?

    The clearest way to observe the difference between a stable and an unstable air mass is to look at the clouds: 1. A stable atmosphere will have largely flat layers of cloud, which may exhibit some lumpiness but will not extend far upwards. There may be several such layers or, occasionally, clear skies. 1. Unstable air will generally have tall cauli...

    It is the vertical profile of temperature, or lapse rate of the atmosphere, which determines whether an air mass is stable or not. The temperature can be measured using an electronic thermometer attached to a helium-filled weather balloon released from the ground. As it ascends, the readings are transmitted back to earth, and, under normal circumst...

    In a recent post, Frank Barrow described adiabatic processesinvolving ‘parcels’ of air rising through the atmosphere. These ‘parcels’ are subject to decreasing pressure as they ascend, and adiabatic cooling results. The rate of cooling is known as the adiabatic lapse rate. Warm air is less dense than cold air. Therefore, if the air ‘parcel’ cools t...

    There are several mechanisms by which air can be encouraged to start rising. These include: 1. Heating from below: If air is located over a surface which is warmer than it is, it will be heated by the surface. This will make it less dense, and it will start to rise 2. Coasts and hills: Physical barriers to airflow will force air to rise over them 3...

  4. To be unstable is to lack stability, meaning things could change without warning, like an unstable bookshelf that is likely to fall down. If you are unstable emotionally, you might be ecstatically happy one minute and horribly depressed and angry the next.

  5. The meaning of UNSTABLE is not stable : not firm or fixed : not constant. How to use unstable in a sentence. Synonym Discussion of Unstable.

  6. If people are unstable, their emotions and behaviour keep changing because their minds are disturbed or upset. He was emotionally unstable. Coleridge was also a highly unstable person.

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