It is a pH indicator, I guess. Is it right Stiffi???
It is a solution or mixture of several indicators.... it can undergo a large range of colour change .... That colour directly indicates the exact Ph of a solution or substance,,,... it is mostly used to test the acid or alkalis in a solution...
A universal indicator is a pH indicator that shows a wide range of colors to indicate the acidity or basicity of a solution. Its main advantage is the ability to provide a detailed pH measurement, unlike other indicators that typically offer limited color changes. This makes it a useful tool in various scientific contexts.
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Jawaban:It's 4 o'clock. The children are coming into class.Penjelasan:"into" digunakan saat masuk ke dalam suatu tempat.Contoh: She walks into the room (dia masuk ke dalam ruangan).Dalam konteks ini, anak-anak masuk ke dalam kelas, jadi kata yang tepat adalah "into". Yang salah jika:"to class" → hanya menunjukkan arah, bukan masuk ke dalam."in class" → berarti sedang berada di dalam kelas (sudah di sana), bukan sedang datang masuk.
Jawaban:Kalimat lengkap dan benar adalah:"It's 4 o'clock. The children are coming to class."Atau bisa juga:"It's 4 o'clock. The children are coming into the class." (jika maksudnya mereka sedang memasuki ruangan kelas)penjelasan:"to class" = menuju kelas, secara umum."into the class" = masuk ke dalam ruang kelas.