Oxford English Dictionary https://en.oxforddictionaries.com/definition/fluid https://en.oxforddictionaries.com/definition/fluid no fixed shape and yields easily to external pressure https://en.oxforddictionaries.com/definition/fluid https://en.oxforddictionaries.com/definition/fluid https://en.oxforddictionaries.com/definition/fluid https://en.oxforddictionaries.com/definition/fluid https://en.oxforddictionaries.com/definition/fluid