Tại sao giữ nước đá lâu chảy người ta thường để nước đá vào thùng xốp Tại sao mùa hè không khí trong nhà mái tôn nóng hơn trong nhà mát xanh còn về mùa đông không khí nhà mái tôn lại lạnh hơn trong nhà mái xanh Tại sao muốn giữ cho nước trà nóng lâu người ta thường để ấm trà vào giỏ có chèn bông trấu Hoặc mạt cưa

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